[What's it for?] Hydrogel gel sheets, accessory for all Abdominal Belt, AB Trainer, Waist Trimmer Belt, ABS Toner Body , ABS Stimulator. [How long can the gel sheets last?]The gel pad need to be replaced regularly, pad could 20-30 . [How to maintain in a ?]Clean/dry your skin using; Stick back to the cardboard after using this Gel Sheets Pad Gel sheets are consumables,replace with a new sheet at the following :1.Obviously feel the conduction performance decreased,cause decreased strength. 2.When it loses adhesiveness, the adhesive surface(gel)dries out or is gouged or dirt/grime that cannot be removed exists. How to use: The side attached to the white paper should be attached to the gel pad.The side attached to transparent film should be attached to the skin. colour: blue Material: hydrogel size: 4 * 6cm Package Contents: 48*Abs Trainer Replacement Gel Sheet Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.