Currently out of stock on Amazon. Grip Strength Arm Builder Forearm Barbell Grip Bicep Peak Enhancement SQUAD (Gorilla Squad) Dumbbell Grip Training Gear GORILLA Set of 2 GORILLA SQUAD Dumbbell/Barbell Grip Dumbbell Grip Effect ①: Attaches to dumbbells and barbells, making the handle thicker, which strengthens grip strength, thus strengthening grip and forearms. Dumbbell Grip Effect ②: Activates nerve transmission in the arms, mobilizing more muscle fibers in the biceps, which is effective for muscle hypertrophy (bicep peak enhancement). The slit can be widened for easy attachment to the handles of dumbbells, barbells, and chin-up bars. Made of 100% high-density silicone. Gentle on the skin, with high durability and flexibility, so there's no need to worry about damage during training. S size (Diameter: 4.8cm / Inner diameter: 2.7cm / Length: 12.5cm / Material: High-density silicone)