The 24oz Vinyl-coated Quick Cage is made from stainless steel and is vinyl coated to protect the finish on painted metal bottles as well as adding friction to the cage to help hold the bottles and keep them from rattling. The cage is attached to the bike with a hook and loop strap and a Kraton block. The block is soft and flexible to allow it to work with any frame shape. The cage is specifically designed to carry reusable stainless steel bottles. The 24oz Quick Cage holds bottles from 16 oz. to 26 oz. sizes, including single-walled, insulated, or plastic bottles made by manufacturers like Klean Kanteen, Hydro Flask and MiiR. The cage also holds the JBL Charge 2 speaker perfectly! The cage can be placed anywhere on a bicycle where there’s room, even on the stem of the handle bars. Proudly made in the USA.