The Leonardo Micro Mini Wave brass imprinter (brass stamp) has a pattern head of 6.5mm and is 5 inches long. It is a spiral design but looks more like a wave since the spiral cant be made any tighter to look more like a spiral...so it is a wave. It can be used anywhere on a bead and are small enough that you can place a few imprints on a bead or just make small beads for sets or even head pins. The sample imprint looks different on various colors of glass. We are currently designing new patterns and will offer them when available. The imprint designs are custom made here in America and have been tested for durability, quality and excellence. Bead not included