This ElectraStim Metal Cock Ring Set features five varying sizes – from 36mm to 44mm increments each time. This pack is suitable for use with your existing ElectraStim range of kits, play-packs and accessories. Ideal for beginners, foreplay or fetish fantasy play, this pack will provide hours of fun. Please note that this is an ElectraStim accessory, which must be used with an Electroplay mains pack. Not to be used on persons with heart conditions.