Brain key chain. It is quite magnificent to ponder the notion that every thought that we think is simply a chemical being released by nerve cells. However, it is impossible to think two thoughts simultaneously so what part of us is it that chooses the thoughts/chemicals that are released. Our greatest strength is the ability to focus our attention on the thoughts that will be the most beneficial to our lives. The pewter brain measures approximately 1.75" height and 1.5" width. It hangs from a steel standard size key ring.