Package includes: Altogether 12 pcs (5 packs of 2 pcs each) Each gel pad is 2.4 inches in length, 1.6 inches in width, 0.032 inches in thickness, Function: As an accessory for abs trainer, this vicarious gel pad can be used on various types of muscle trainers, Material: Made of Polymer gel, the replacement gel pad is soft and environmentally friendly. Suitable for the corporeity of most people, it will not produce adverse stimulation to the human body when transmitting the potential signal in high efficiency, Easy to use: All you need to do is take the sealing bag apart, separate the two hydrogel pads, then tear off the protective film, and stick them to your trainer, Tips: Please clean and dry your skin before using. After using the gel pad, wash the gel which stick on the side of your skin with clean water and dry it quickly with a hair dryer. And then, put the torn protective film back on it and place the whole trainer machine in a shady place. As long as you use it properly, the gel pad can be used recyclable for about 20 times.