Selby's Crystal Clear Self Stick Bumpers For Glass are non-skid pads that adhere to shelf rests and table tops to accommodate glass shelves safely. They are also used as bumpers on glass and wood doors. The bumpers are å_" diameter and are available in two thicknesses,åÊ1‰�ã16" andåÊ3‰�ã16". Available in boxes of 1000 pieces mounted on peel off sheets of 200. The bumpers are constructed of crystal clear butyrate.