Closed rivets are used in applications where both sides of the rivet are visible or where the rivet comes into contact with another surface, such as bag handles, grips, leashes, collars, harnesses, etc. The listed price is for one pair. This rivet size is used not only for beta biothane straps. The correct rivet size depends on the thickness of the material being joined, such as biothane, nylon webbing, leather, or fabric. Always add 2mm to the width of the material for proper measurement. Material: steel, matte black.