specification: Item Type: Electrode Pad_x000D_Material: Silicone _x000D_Needle Hole Diameter: Approx. 2mm / 0.08in_x000D_Description: Suitable for all kinds of medium frequency electronic physiotherapy machines.Help improve blood circulation, promote metabolism, eliminate fatigue_x000D_Size: Approx. 20.5 x 14cm / 8.1 x 5.5in Features: 1Suitable for knee bending part, neck, back and other parts, widely applications and wonderful accessory for electronic physiotherapy machine. 2Suitable for all kinds of medium frequency electronic physiotherapy machines. Help improve blood circulation, promote metabolism, eliminate fatigue. 3Made of high quality silicone material, soft and comfortable to use, not easy to break and damage, having long service time. 4Excellent electrical conductivity, specially designed for therapeutic equipment, easy and convenient installation. 5Reusable design and durable to use, 20.5 x 14cm / 8.1 x 5.5in of the size, exquisite workmanship and good using effect. PackageList: 2 x Electrode Pad