The size is perfect for my rug. It’s sticky on both sides, needed to walk barefoot on it while positioning it on the carpet, grey side up as per instructions.  The rug has, for last few days not “ridden” over the carpet, so I’m happy with that.  I am looking to buy a hall runner & will certainly buy this rug gripper to keep it in place.  A good buy pleased that it “does what it says on the tin”.