COMPATIBLE WITH: iROCKER OG 7.0/8.0 & BLACKFIN 6.0/7.0 (NOT ULTRA(TM) BOARDS) Whether you&';re an experienced paddler or new to the sport, sometimes we all lose a fin. This replacement, flip-lock system center fin is compatible with all boards except ULTRA(TM) models. Fin depth: 8.5" or 22cm Weight: 0.5 lbs. or 0.2 kg Please Note: Older boards may not be fully compatible with new replacement fins. If you need to make small adjustments to the length of your fin to achieve optimal fit, we recommend filing the edges of the fin with sandpaper.