[What's it for?] Hydrogel gel sheets, accessory for Abdominal Belt, AB Trainer, Waist Trimmer Belt, ABS Toner Body, ABS Stimulator. [How long can the gel sheets last?] The gel pad should be replaced regularly; each pad can last for 2030 uses. [How to maintain them?] Clean and dry your skin before use. After using the gel sheets, stick them back to the cardboard. Gel sheets are consumables. Replace with a new sheet in the following cases: 1. When you notice a significant decrease in conduction performance, resulting in reduced effectiveness. 2. When the adhesive surface (gel) loses stickiness, dries out, or has damage or dirt that cannot be cleaned. [How to use:] The side attached to the white paper should be applied to the device. The side attached to the transparent film should be placed on the skin. Color: Blue Material: Hydrogel Size: 4 x 6 cm Package Contents: 48 x ABS Trainer Replacement Gel Sheets Note: The package includes only the items listed above. Other products are not included. Note: Lighting and display differences may cause slight color variations between the image and the actual item. Measurement error is +/- 13 cm.