17mm Silver Plated Cowrie Shell Slider for 10mm Flat Leather. This versatile interlocking slider is great for mixing with other metals! It is made from zinc plated with silver and is clear shiny coated. This slider is free of lead, nickel, cadmium and is hypoallergenic. This slider is approximatly 17x12mm and the hole size is 10mm x 2mm. Use with 2 strands of 5mm flat leather or 1 strand of 10mm flat leather. Sold individually.