fingertip gyro pure copper finger spiral children's boring toy american high-speed decompression finger gyro

1. by size.large, small, overall size, leaf size. 2. by material.pure copper plate, aluminum alloy plate, zinc alloy plate. 3. by design.leaf removable version, leaf non-removable version.bearing removable version, leaf non-removable version. 4. distinguish by bearing.have big bead small bead, general bead is smaller, lasting longer.