Rubber Coated Hex Dumbbell Set. Why Choose Our Rubber Coated Hex Dumbbell Set?. Includes a PAIR of 20 lb dumbbells, with various sizes available from 5-50 lbs for tailored workout versatility. Material: Cast Iron,Rubber,Cold Rolled Steel Features: With Storage Tree,Hex Design,Textured Handle,Rubber Coated,Non-Slip,Encased Heads,No-Roll Design Sport/Activity: Gym & Training,Weight Lifting,Strength Training,Fitness Set Includes: 2 Dumbbells.