How long is the seven-star drift line group suitable?

Seven-star drift is generally suitable for a line of about 35cm, and the length of the sub-line is about 15cm. Seven-star drift is a buoy used for a long time in traditional fishing. It consists of seven floating beans. Suitable for fishing bottom and floating, not for fishing depth, and the signal will be unclear when fishing depth is deep. The advantage of seven-star drift is that it can be used directly without pruning, and the replacement is simple, but the adjustment of drift is more difficult. The disadvantage of the seven-star drift is that when the fishing group enters the water, when the buoyancy of the floating beans is equal to the gravity of the lead drop and the hook, the floating beans will stand upright on the water, while the fishing line is vertical in the water, and there is no inclination angle, so it is difficult for fish to find out in time when eating bait. To sum up, a line of about 35cm is generally suitable for the seven-star drift, and the length of the sub-line is about 15cm.