Surfboard single fin. Approx. 24cm vertically in simple measurement. Maximum length (diagonal) approx. 30cm. I use the same fin on a crime board. It's not a high-end fin, but I think it's just right for riding near the shore or in shallow water. Ships via Yu-Packet Post. There are nubs on the fin base to prevent it from bottoming out. Depending on the fin box, you may need to shave it down, but I use it as is. The photos are everything. ★Size is a simple measurement. Please look at the images. ★No claims, no returns. ★If payment is made during the daytime, it will be posted on the same day.