Urban Fitness Hex Dumbbells - Neoprene Covered (pair) (2 X 1Kg - Purple). Neoprene-covered cast iron dumbbells. Specifications: Dimensions: H:11.0 x W:17.0 x D:5.5 cm Model Number: UFW031. The Urban Fitness Hex Dumbbells are a must have for when you want to train anytime anywhere. Easy to grip with a cast iron inner and Neoprene-cover. Shape up fast at home with this Neoprene Dumbbell Set. Neoprene dumbbells are premium quality, and will aid a variety of workouts to improve your health, strength and fitness. Set of two Dumbbells. Neoprene coated, built to last and slip free. Easy to clean.