| Number of Items in Set | 1 |
|---|---|
| Color | Black |
| Item Diameter | 2 inch |
| Material | Natural Volcanic Rock |
| Set Includes | Training Ball |
| Item Length | 2 inch |
| Vintage | No |
| Brand | Unbranded |
| Department | Unisex Adults |
| Type | Gripper |
| Unit Type | Unit |
| Item Height | 2 inch |
| Model | Natural Callus Ball |
| Features | All Natural, Highly Abrasive, Surface, Durable, Ergonomic |
| Unit Quantity | 1 |
| Sport/Activity | Gym & Training |
| Item Weight | 0.5 oz |
| Item Width | 2 inch |
Check the listing for details. New Callus Ball for Hand, Hand Grip Strength Trainer for Rock-Solid Hands, Build. Color: Black, Condition: New. Listed at 18.00 USD. Volcanic Lava Rock Ball – Professional Callus Builder & Grip Trainer. (1) Volcanic Callus. It provides a consistent, rough texture that won't smooth out easily like cheap pumice stones. Heavy-Duty Texture: The abrasive surface of this stone is ideal for skin conditioning and building the friction resistance needed for high-weight grippers (like CoC) and deadlifts.