Please name hidden weapons in some martial arts novels.

Flying knives can be divided into double-edged and single-edged ones. All made of steel. Double-edged flying knife is eight inches long (including six-inch blade) and weighs twelve ounces (including three-ounce blade, four-ounce iron handle and two-ounce cutter head). The blade is sharp, as thin as paper and willow-shaped, also known as "The Lancet". The handle is wrapped with red and green ribbons, about two inches long. The single-edged flying knife weighs about 892, and it is equipped with 12 knives 1 sheath. They are staggered into two rows with six knives in each row. They are inserted in the scabbard, and the handle is exposed. The right scabbard is inclined to the left, and the left scabbard is inclined to the left.

Ruyi beads are round tiny iron beads, each weighing 30 to 40 cents. It is the smallest hidden weapon. When distributing, gently buckle the iron ball with two fingers, and then dig it out with the nail of the other finger to make it shoot from a distance. Ruyi beads are usually difficult to shoot from a long distance because of their small size and light weight, so they are specially targeted at the weak parts of people. But with practice, you can shoot from a long distance.

The money dart, also known as "arhat money", was used in hidden weapons in the Qing Dynasty to grind its round edge into a blade angle. Because it is easy to manufacture and carry, it was widely circulated in Qing Dynasty, and it was the most widely used one among all hidden weapons. Money darts fly and hurt people, hurting people's faces and wrists. It is difficult to practice this device. Generally, it is successful to practice until you can fly and drop the tree in 30 steps.

The collar is in the shape of a circular iron ring and is hidden in the sleeve when not in use. When using, take out the armband and throw it at people, which will hurt people with its weight.

Plum blossom needle: This hidden weapons is slightly larger than the general sewing needle, and its tip is pentagonal, trilateral or polygonal. Plum blossom needles are generally not used for attack, but for defense. Once I ran away, in order to stop people from chasing me, I took the plum blossom needle out of my bag and scattered it on the ground, hurting people's feet.

Northerners call archery holding an arrow. There are three styles. One is that the whole body is made of iron, as small as a finger, the arrow is triangular, the rod near the arrow is thinner, and the thicker it is, the heavier it is to adjust the weight. It can fly in a straight line after it is issued, and it is easy for beginners to practice. The other is made of iron and bamboo, the arrow is made of iron and the rod is made of bamboo. The third one is made entirely of bamboo, without arrows and feathers. After success, it can stab people in the chest from a hundred paces away.

Shaolin bright silver darts are four inches and two minutes long, with tassels on the back and connected by rings.

The Shaolin jujube kernel dart is one inch and five centimeters long, which looks like jujube kernel and is twice as big as it.

Shaolin money dart is about one inch in diameter, with blades around it and square holes inside.

Flying hook: invented in Ming Dynasty. Also known as "iron feet". Shaped like a ship's hair, made of iron. The barbs of the limbs protrude from the round rod and the hooks are sharp. There is a round hole at the end of the rod, which is passed through by an iron ring and tied with a thick rope. This device can only be used under the condition of heavy weight and high power. When using, throw the flying hook and attack the opponent. Mostly used in water warfare.

Flying thallium consists of two parts, namely thallium and rope. Thallium is a cone-shaped iron with a blunt head and a ring at the tip of the cone to tie the rope. There are two thallium, one of which has a thin iron thorn at the top. The rope is two feet long, and there are fine iron thorns at the end of the rope. The rope is twenty feet long, and there is a wrist weighing one thousand kilograms at the end of the rope.

Flying claws consist of claws and ropes. Paws are as big as human palms and made of iron. The flying claw is shaped like a palm, and the small joints in the fingers are surrounded by small machines and controlled by ropes. When using the flying claw, throw the attacker with the claw and throw the rope quickly. The small machine, including the claw tip, is deeply immersed in the human body, so that people can't escape.

A flying hammer consists of a hammer and a rope. The hammer is hammer-shaped, with a cylindrical iron bar connected to it. There is a ring at the lower end of the iron bar, which can be tied with a rope. The length of the rope is 15 to 20 feet, and there is a wrist weighing 1000 pounds at the end of the rope.

The guillotine consists of rope and blade. This rope is more than two feet long. There is a thousand pounds of wrist at the end of the rope. The rope head takes the rope as a ring with a diameter of more than one and a half feet, and thin-edged blades are evenly distributed on the rope ring. When in use, a person's head and neck are covered with a rope, then the rope is retracted, and the blade rotates to cut the head and neck.

Acupoint judging pen is also a short instrument. Its main body is a hollow iron pipe with springs and pins inside. When in use, the pen can be held at a larger point. If you want to use it as a hidden weapon, you just need to disarm the safety bolt. When the needle was released, its nib suddenly flew out and hurt people with the tip of the needle. Acupoint judging pens can be used alone or in pairs.