This specialist rug safe gripper from JVL intended for use on carpet floors only offers a simple, effective and convenient anti-slip solution for preventing rugs from slipping and moving on carpet floors. This anti-slip underlay can be only be used once, when the rug is moved the slip resistance is compromised. Your underlay should be around 5-10 cm narrower than the length and width of your rug. Not effective if placed on thick pile carpets.