[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, every pad could 20-30 .[How to maintain them in a ]Clean or dry your skin before using Stick them back to the cardboard after using this Gel Sheets PadGel 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 its adhesiveness, the adhesive surface(gel)dries out or is gouged or dirt or 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: blueMaterial: hydrogelsize: 4 x 6cmPackage Contents: 48xAbs Trainer Replacement Gel SheetOnly 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.