Quantity: the package includes 10 pieces of mould. include 4pcs Straight surface ring mold and 6pcs Cambered surface ring mold.
MATERIAL : Resin molds for jewelry made of silicone, flexible, durable and reusable, easy to use.
HIGH QUALITY : Improved version, high quality silicone. Share your handiwork with your friends and family, enjoy happy times.
Size: inner Dia of the finished ring. 16mm=US 5; 17mm approximate US 7(17.3mm); 18mm=US 8 ;19mm=US 9; 20mm=US 11; 21mm=approximate US 12(21.4mm)
Someone left a review to say that there is something wrong with our size. They used the wrong measurement. The size is the inner Dia of the finished ring which made use the ring mold, Not the size of the mold.