Large Bombs 4.5 Inch Ball | Climbing Holds | Red Comes in red. The color may vary from the photo. Safe, open-hand design so tendons lay ergonomically. Spherical shape increases forearm and grip strength, boosting endurance. Switch from pull-up, to chin-up, to biceps-pull without regrouping. Extra Large (4.5") Bombs have embedded stainless steel eye bolts.