You should always have a couple of Self-Securing Pins with you when shooting - you never know. The Self-Securing Pins (SSPS) are structural components of the frame construction of the Sunbounce system. Please use your Sunbounce PRO, BIG, or SUN-SCRIMS only when the longitudinal bars are secured by the SSPS. With the BIG and SUN-SWATTER, please also secure the crossbars.