XMark Pro Speed Bag Ball Bearing Swivel XM-2822 Upgrade your speed bag workout with the XMark Pro Speed Bag Ball Bearing Swivel XM-2821. The swivel is the key component of every speed bag workout. It determines your speed bag’s ability to move haphazardly and rhythm-less or quick and smooth. The XMark Pro Speed Bag Ball Bearing Swivel XM-2821 is precision crafted for optimum swing and spinning action. The smooth, ball bearing design offers an intense, professional level speed bag workout with rapid ball bearing rebound action crucial to speed bag training. Accurate rebounds combined with lightening fast speed will push your coordination and reflexes to the limit. Come out on top with XMark, the mark of excellence. Features: - Chrome plated steel construction - Precision crafted ball bearing design for speed and accuracy - Rapid ball bearing rebound action - U-shaped bag attachment - Suitable for heavy use areas