This is an all aluminum spinner. The caps are aluminum and screw together for easy removal. This is designed to work with interconnecting blocks such as Legos.
The weight is 2 oz and the dimensions are 2.5" x 1.25".
The Builder comes with a 608 stainless steel bearing already installed that has been degreased in house. 608 bearings provide a sturdy alternative to smaller bearings while providing less overall spin time.
Manufactured and assembled in the Pacific Northwest, USA.