These high quality brass spinners are made with precision machines. The bearing used inside is a stainless steel R188 bearing. This spinner is made of 18 colourful O rings, 10 machined parts and 1 stainless steel bearing. Every single part is detachable. Each of the 6 heads can be easily taken off so you can experiment with different combinations weighting the spinner in different ways. The colourful O rings make for a cool pattern when the spinner is in motion. Each spinner comes inside a soft carry case.
Great for STEM learning and teaching kids about weights, gravity, etc. These are one of the only types of spinners on the market that you can add and remove pieces to feel the different spin. Just take off one single head and feel how it spins! Lots of fun and educational as well.