Livepro Studio Colored Dumbbell is integrally iron cast, immune to breakage, durable and sturdy. The outer layer is formed by high-grade PVC coating, 2mm thick: PVC dumbbell provides a comfortable hand feel and no rubbing is felt when gripped. It also provides a firm grip, which means you can firmly grip it even with sweaty palm. With extraordinary coloring property, this mini dumbbell has a diversity of bright color options. Each color standards for a different size and it seems to be more cost-effective than PU dumbbell. It is a rewarding investment for any workout space.