Our EBA and deluxe SCBA brackets are composed of a backplate, one spring clip (4110-04) or two spring clips (4111 series), a holding strap (4111 series only) and a footplate. All parts are constructed from durable steel that has been coated by a thermoplastic material that helps prevent rusting and damage to SCBA cylinders. Allegro® 4111-05 Deluxe SCBA with 5 1/4 in Clip, Fits 30 Minimum, hp Cylinder