Composed of a prob rounded tip with five springs of various weights and colors of identification:
Green = 100 g
yellow = 150 g
white = 200 g
purple = 250 g
red = 300 g
On the other end a tip ball of 4 mm diameter is equipped with a magnet that emits a flow of 2000 Gauss, which is also used in the treatment of points.
The polarity of the magnet can be changed simply by removing the tip and reversing the position of the magnet.