Expand your pleasure with electrastim prestige electraloops. building on our hugely popular rubber cock loops design, prestige electraloops are made from a thick (6.5mm) rubber that transfers the delicious electro sensations more evenly for increased intensity. each loop has a machined aluminium adjustment choke in one of three different anodized finishes: red, silver or gold. these premium quality loops are unipolar for use with a wide range of electrastim accessories and 2 are included in each pack. please note that you will require a stimulator (sold separately) to power the loops.uni-polar designadjusts up to 2.35 inches in diameter2mm inputrequires an electrastim stimulator to operate