Features: 30mm diameter, made of high quality PVC, non-toxic and harmless and can be used as an aquarium suction cup. Anti-slip and shock absorption: These suction cups can be absorbed firmly on the smooth surface of the object. You can place the shock absorber between the table and the glass countertop to prevent the countertop from slipping and reduce the impact. Double-sided design: smooth on both sides, strong suction, can firmly bind objects , suitable for fixing aquarium pipelines, fixing fairy lights for holidays and protecting table glass. Multi-function suction cups: suitable for hanging party garlands, fixing aquarium accessories (water pumps, pipes , etc.), office glass pads, etc. Note: This suction cup is only used for smooth surfaces. If the suction cup is slightly deformed, you can soak it in hot water for reuse. If the suction cup cannot be used, please contact us in time and we will give you a satisfactory after-sales plan.