ULTRACORE system is for the really big ballers that dig the most bag-gripping stretch! You get the amazing CORE ballstretcherits 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 ownon 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.We sweat the BIG stuff when we design for your ball needs, we put extra thought into new ways to stretch you harderwe do so much ballsack research, seriously we look at your balls a lot), we see you stretchers stacking our rings for insane sack squeezingULTRACORE has the features to max out your stretch right.HOW TO WEAR: a little lube or spit, gym-sweaty showering is good, stretch CORE and drop your bag through and adjust where you want it, the inner hourglass shape will hold where you put it. If you want the max squeeze effect, slide the stretchy AXIS ring on COREs middle rib for grip...Made of our extra-soft Plus+SILICONE blend, itll keep the grip firm enough with a smooth velvety rubbery comfortable stretch, and the right grip for more play.Oxballs makes the best ballstretchers for all types of nutbags and all sizes and cravings, we use our gear we play with our gear we test our gear to make sure you get the best designs with the coolest features and new ways to play hard.