Easy to install the reflective safety flag with bicycle mounting bracket can be easy to mounted on the rear axle of bikes, no other tools are needed Visible color The bright red safety flag easily attaches to the rear axle of a bike for maximum visibility, keep you safe while riding Specification: Material: polyester and fiberglass Color: as shown in pictures Size: as shown in pictures Package include: 12 x bicycle flags 20 x Fiberglass Pole 4 x Bicycle Mounting Bracket 16 x connecting tube