black mountain merchandise bar grips are 2 inch thick and made from a long lasting non-slip rubber. The inner diameter of the grips is the proper size to match any form of weight barbell, dumbbell, pull-up bar, or kettlebell. The thick grip adaptors are made with a long lasting non-slip rubber with a move hatching layout for brought grip. Barbell grips are extraordinary for fast boom in forearm and biceps energy and size. Fats grips assist to lessen calluses, hand ache, and stress on your joints compared to the usage of popular metallic bars. Every set of think grips comes with a manufactures lifetime guarantee.