The Signature Series FlexRez and FlexLite models were the first center fins ever to be made available in black, translucent and of course transparent UVR PolyCarbonate material. Flex-Tip Technology - this allows for our fins to provide a wide range of surfing desires. This model not only provides stability for the amateur, but provides professional maneuverability, (bottom turns) drive and hold (for nose riding). All of Dorsal"s fins are computer designed and balanced for precision and made in the USA. Black, Transparent & Translucent Fins manufactured with high quality, 100% recycled, medical grade UVR Polycarbonate material. Fits in standard center fin boxes. Sizes Available: 7", 8", 9", 10"