spongsteel , cast iron , metal dumbbells 1.Any material you can choose 2.OME service available 3.different size sponge steel , cast iron , metal dumbbells :1. Sponge steel , cast iron , metal dumbbells 2.OME service available 3.Different sizes according to your needs4.Factory has been set up for 11 years5.Weight: 1000g or other weight you need6.Size: 16*6*6cm and other sizes you need7.About 8 ...