All of our Picture Frame Rubber Bumpers are made of 100% polyurethane. No plasticizers, oils, or fillers are added during their manufacture as is often the case with lower-end bumper products. They are non-staining and non-marring; crack resistant and resilient.
Bumpers are supplied "kiss-cut" on protective peel & stick backing pads of 25 bumpers per pad, ready to use.
To apply, simply peel off individual bumpers from the backing pad as needed and apply to the bottom corners of the backside of your frame--no nails, screws or drilling required.