The fastest, lightning quick, atomic power, micro-technology speed bag on the market. Space age cover supplies the speediest rebounds and atomic quick responses with the durability and longevity of leather. Ultra sheen and dazzle complements your amazing skills and high level success like no other. Each Atomic Speed Bag is crafted with leather welted seams and triple stitched nylon threading. Complete with a butyl latex rubber bladder that is manufactured for jet fast action, perfect balance and true rebounds. The small 6x8inch bag is probably the fastest bag on the market. Well constructed, recommended for all experts. Spare bladders available.