Package include: 10Pcs, 20Pcs, 50Pcs, 100Pcs electrode pads. Material: Silicone + Gel. Size: 5 * 5 cm, 5 * 9 cm. Fit 2.0mm plug. Features: Non-woven fabric, self-adhesive, reusable, bio-compatible, dry out resisting, lower impedance, no hot spots. Suitable for various medium frequency electronic physiotherapy machine. Help to improve blood circulation, promote metabolism and eliminate fatigue. Cleanse your skin before using electrode pads for better results.