The Flexi Dolphin 9" from Boardworks A flexible version of the classic 9" all-around dolphin fin shape for longboards and standup paddleboards for safety and shallow water use. Made from a less-rigid polymer designed to flex for safety and to minimize fin box damage due to unintentional impacts with rocks, reef, shore, etc. Compatible with all US-style standup paddleboard and longboard center fin boxes as well as Air7 inflatable SUP fin boxes. NO TOOLS REQUIRED " Stainless steel thumbscrew and slider plate can be tightened by hand for quick and easy installation Specifications Color: Black Quick Connect: 9" Dolphin Fin Normally Ships in 0 to 3 Business Days Features Benefits Benefit: Includes Stainless Steal Tool-Less Hardware For Easy Installation And Removal Without The Need For Tools Feature: Fits Any Sup Or Surfboard With A Standard Longboard Fin Box Use: Made Form Flexible Materials To Minimize Potential Fin Box Damage Due To Fin Impact Or Improper Use Design: Suited For A Variety Of Conditions From Surf To Flat Water, Improves Tracking When Paddling Or Surfing Guaranteed Workmanship and Performance