Minerals. Crystals. Cool. :)These are sawed, filed and engraved by me. They may each be a little different, as I make one for you special.Available in one size: 1/4x3/8" (6mmx9mm)Rectangle stock, slightly less from filing/sanding x 3" long.Designed by Randy Barnes, made by me.Hardened and then tempered tool steel.This is for the one stamp design mentioned. Other stamps not included.