SWHACKERShrinkbands,elastic ringsparts:elastic rings(shrinkbands)parts,whenyou have exhaustedthose supplied withSwhackerbladesandreplacement blades.They areinfactshrink tubing,if they do nottightenenough, soyou canpassa littleheat from alighter ora hairdryer(taking carenot to overheatanddamage).