Sunshine Serafina sturdy and durable Flat Sided split Assorted Key Rings Key chains Keys Holder 50pcs(Silver : 20pcs, Antique Bronze: 20pcs, Gold: 10pcs) (Multicolor) Size: 30mm(outside diameters) * 25mm(inside diameters) Net weight: about 3.8g/pcs Lightweight and sturdy High-security connection and attachment for keys and other important items. The spring tension is firm enough that keys don't slip out and also soft enough to make putting items on reasonably easy.