Usage Tips:Firm Adsorption: These suction cups can stick to smooth surfaces such as glass, boats, SUPs, cars and campers. When driving and camping, you can attach the suction cups to the back and side of the car to build a tent. Heavy Duty Suction Cup: Our suction cup is an ideal tool for travel or home use . Each anchor can support 10 kg. It is suitable for most smooth non-porous fabrics. It is used with a bungee cord or a rope (not included). Convenient and practical: The suction cup anchors can fix almost anything better, no need to worry about dangerous loads, and also attach tents and from tarps to cars and trucks, which is convenient for RVs. Easy to use: When using our suction cup, simply push the suction cup onto a clean, smooth surface. When you want to lock it, just twist the handle to lock it firmly without scratching your car. Our suction cup is made of strong materials (PP and TPU) with high strength. Also, it maintains long-term durability. It has a viscose coating, which has a strong suction force and is suitable for objects with solid materials.