the gel sheet used in the above product obviously leads to a decrease in the properties, resulting in a decrease in strength. When the viscosity is lost, the adhesive surface (gel) will dry out or be cut off or there will be dirt that cannot be removed/ dirt. use about 20-30 , if you use and maintain correctly. Clean/dry use; stick on cardboard after use. Trainer Replacement Gel Sheet Trainer Replacement Gel Trainer Gel Sheet Abdominal Belt colour:blue Material:gel size:4*6cm Package Contents: 30 * gel pads Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.