ULTRACORE system is for the really big ballers that dig the most bag-gripping stretch! You get the amazing CORE ballstretcher—it’s got outer ribs for super long stretch: it stays taller on your sack with more padded grip in the middle for a fatty bag-squeeze. You also get the rib-gripping rubbery AXIS power-ring its got channel ribs inside that morph with the outside ribs on the CORE stretcher. CORE ballstretcher is an amazing ballstretcher on its own—on your nuts the inner smooth tunnel wraps your sack with a medium firm squeeze, but add AXIS power ring on top of the cogged CORE and get the most MAX BAG SQUEEZING. <br><br> • CORE ballstretcher has more squeeze inside <br> • CORE has ridges outside for AXIS inner ridges to grip <br> • AXIS power ring is designed to add double the squeeze to CORE <br> • Extra-soft Plus SILICONE is smooth on the nuts