Bionix Neoprene Cast-iron Dumbbells Pair features an anti-cracking, non-toxic,...Bionix Neoprene Cast-iron Dumbbells Pair features an anti-cracking, non-toxic, odorless, abrasion-resistant neoprene shell for a comfortable, non-slip grip that also prevents damage to floors. This strength training equipment is made of cast iron to...more