Compex Snap High Performance Electrodes - optimal restitution for electrical power for more intense sessions to guarantee greater effectiveness. Easy connection with a press on system, extended lifecycle (depends on skin type and conditions of use). Pack of 2 x large electrodes (5cm x 10cm)Pack of 4 x small electrodes (5cm x 5cm)Compex Wired Electrodes - for use with Energy, Sport 400, Sport 3.Pack of 4 x large electrodes (5cm x 9cm)Pack of 4 x small electrodes (5cm x 5cm)