The Grind Dumbbell Set features an assortment of dumbbells from 2.5 to 50 LB, and a Dumbbell Rack to store the entire set. The Nike Grind Dumbbell is made from at least 20% Nike Grind rubber by volume, a byproduct of Nike's footwear manufacturing process. With sculpted edges, a knurled, ergonomic handle, and an anti-roll design, this dumbbell offers both durability and comfort for all your training sessions.