Pack of 4 TensPro TENS electrodes with High Conductivity 40mm diameter. Suits all machines which accept normal pin tens connector, supplied as shown with terminals glued into pad, with a flexible mesh backing for maximum use and wear. Available in any quantites upon request, however can be bought on amazon in other quanities (4,8,16,32 pad packs) Pads measure 40mm diameter (not the cheap 30 or 40mm ones our competitors sell!), and are made of 2mm thick conductive rubber (latex free)