YAJU Material: Polymer gel is used to replace the gel pad, which is soft and environmentally friendly, and will not cause adverse irritation to the human body. Packing includes: 40 pieces in total, 20 pieces (2 pieces in a pack). Each gel pad is 2.4 inches long, 1.6 inches wide, Function: As an accessory of abdominal muscle trainer, this alternative gel pad can be used in various types of muscle trainer Easy to use: You only need to disassemble the sealed bag, separate the two hydrogel pads, then tear off the protective film, and then stick them on your sneakers. Reminder: Please clean and dry your skin before use. After using the gel pad, wash the gel sticking to one side of the skin with clean water, and then quickly dry it with a hair dryer. Specifications Color: dark blue Material: Hydrogel Each piece size: 2.4*1.6*0.032 inches How to use: 1. Before sticking on the skin, please keep the skin clean and dry before sticking. When you are done, keep them in a sealed bag to prevent the gel pads from drying out quickly. 2. It may not be sticky enough after several times of use, you can drop a few drops of water, smooth the water, and wait for 5-10 minutes until the water is completely absorbed. 3. The gel sheet is a consumable product. If it feels excessive or weak within one month after opening, please replace it with a new one.