Pandahall 1 Box Silver Iron Open Jump Rings, 4~10x0.7~1mm Size: about 4~10mm in diameter, 0.7~1mm thick. Material:Iron; Shape:Ring; Usage:Jump Ring Metal Color: Silver Jump rings, a staple item in any jewelry making, are helpful and available in jewelry design. Shipped by USPS,takes 7~15 days to receive it.