Electrodes for Bluetens DUO SPORT reusable 30 to 40 times made of silicone gel hypoallergenic leaves no residue on the skin and odourless. For use on two limbs or two joints at the same time. Electrodes only compatible with the Bluetens Duo Sport 4 rectangular electrodes (100x50mm) with 2 snaps 8 square electrodes (50x50mm) High quality adhesive electrodes for a Better conductivity and diffusion of effects