The Sunbounce system consists of an aluminum frame that can be easily assembled and combined with different reflecting, light-reducing, or light-absorbing screens. The Bungee Snakes (25 Pieces) from Sunbounce are used to fasten the screen (not included) to the large, free-standing Sun-Scrim/Butterfly frame (not included), using a unique locking system for the bungees that ensures a secure fastening and a quick release. A bungee is a type of elasticized rope.