The Frenzied Three-four-nine-tooth Linkage Fingertip Top

Product information: 

material: Metal
Metal Classification: Copper
Whether electric: No
Is it multifunctional: No
Packing method; Net bag
3C configuration category: Toys over 14 years old
Color: Black
Applicable age: Elderly (above 61)
Name: Fingertip Top-Nine Teeth Linkage
Version: Pure copper plate (aluminum cover)
Bearing: R1. 88 steel ball bearing
Size: 62x20mm
Weight: 114g
Features: Smooth rotation, cool one axis drives multiple axes