36 Piece Universal Ring Sizer Gauge in Multicolor Aluminum Multi-color aluminum in black, blue, red, gold and silver 36 Pieces on a metal 2 1/2 inch diameter hoop - sizes 1-15 (by standard US half sizes) Lightweight and durable - you will be using this ring sizer for many years to come Finely crafted for accuracy - all sizes are clearly and permanently marked on both sides An excellent tool for the professional jeweler