This was Rich's first attempt at making a smaller (but not mini) one-piece top that could achieve some nice long spin times from standard materials. He was successful and this is a VERY popular top and hard to find for sale any more. It's a truly great spinner, and I've been able to achieve spin times over 15 minutes with mine. Rich also added a bearing at the top of the stem so that you can ALSO spin this one upside down! Really fun stuff and a truly great top. These tops were made in 2016 and are 0.98" in diameter.