Stock #20 - 37mm round x 5.5mm thickness. Authentic RARE vintage Bakelite!! No two rings are exactly alike. They all have their own wonderful uniqueness because of slight color variation due to the ageing process. Great for jewelry and accessory designs. I believe these were commonly used in Go-Go belt designs. These Bakelite rings were found in the famous vintage bead hoard. Why is Bakelite so special? It was invented in 1908 and produced through the 1930's. Bakelite was called the material of a thousand uses. Bakelite was only made for a short period of time and there is no other material out there that compares! The feel and look of Vintage Bakelite is what has intrigued us here at A Grain of Sand. Authentic Bakelite is not not so easy to find. We are happy to say that these Bakelite beads and components are now available right here! All of our Bakelite has been tested for authenticity.