Performance Tool's low-profile, 40 in. plastic creeper with 6 casters is ergonomically designed to contour to your body for comfortable back and neck support. They are made of a material that is resistant to most solvents, grease and oil found in the common shop. These workshop creepers feature a covered foam headrest for maximum comfort and have two storage trays conveniently located on either side. They also have 6 casters that pivot 360 degrees for easy movement.