InvisiHold Round Furniture Gripper, Floor Protector Pad Dense Rubber-Set of 4 (4" Round) rubber Natural textured rubber surfaces grab floor and furniture No adhesives or sticky tape; Simply place InvisiHold directly under furniture leg Extremely dense 1/4" thick gripper pad absolutely stops furniture moving, stays out-of-sight Made in USA of American rubber and dense fiber center InvisiHold effectively stops furniture moving on all floors and protects floor from damage