These 4 pieces of suction anti-slip grippers can simply be stuck to the back of a mat. The glue will not remain, and they can be washed repeatedly. It is easy to take them off. Use them on mats at the entrance, in the kitchen, or bathroom. Please take note This product cannot be used on hot carpets, or on top of tatami or a carpet. The adhesive surface of the grippers cannot be peeled off once affixed. If the adhesive portion is stuck to the floor as you remove the mat, wipe it with a wet cloth. When drying the anti-slip sheets after washing, do not expose them to sun light for an extended period of time. How to use Before attaching the anti-slip sheet, thoroughly remove any dust off the surface of the mat. Peel off the mat’s protective stickers and place the adhesive side on the mat. Wipe the floor before placing the mat to remove any wet spots or dirt, place the mat on the floor with the adhesive side of the anti-slip sheet under the mat, and press it to firmly stick to the floor. Materials Adhesive material: acrylic type Core material: polyester Suction surface: acrylic resin