ABS material, thick and textured.Multiple non-slip stripes, which is equivalent to being embedded in bottom of the mattress and will not lift the mattress.Folding de sign is suitable for mattresses of different thicknesses, 4 mattresses and sheets are clamped in four packages, giving you a neat and clean bed.Steps to use: Take off the fixed buckle; lift the mattress slightly, put the fixed buckle base into the four corners of the bed, put 1-2 in each corner; put the buckle into the big hole on the bed sheet cover, and push the card upwards Fix it with small holes; it is best to fix the feet of the bed, 4 or 8 will do.