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The ULTRACORE system is for the really big ballers who are into most bag gripping stretch! You get the amazing CORE Ball Stretcher - it has outer ribs for a super long stretch: it stays bigger on your bag with more cushioned grip in the middle for a fat bag squeeze. The AXIS Power Ring has channel ribs on the inside that connect to the outer ribs of the CORE Stretcher. Length: 5 cm / Width: 5 cm / Depth: 5 cm / Inner diameter: 3-4 cm / Outer diameter: 5 cm / Product weight: 0.057 kg