[Premium Material] Made from high-quality PVC material for durable, long-term use. Suitable for inflatable stand-up paddle boards, surfboards, and paddleboards. [Balanced Stability] Attached to both sides of the board surface to assist with central water flow alignment. Typically mounted on the bow section of the board's bottom to help protect against damage from reefs or impacts. [Multifunctional Design] Tracking fin enhances stability and directional control. Features high strength, low weight, high impact resistance, and high heat resistance. Compatible with various inflatable surfboards, including shortboards, longboards, and stand-up paddleboards. Can also be installed on kayaks to improve water division and reduce resistance. [Easy Installation] Apply adhesive to both the installation area and the fin base, align properly, then press into place. Use a hair dryer to heat the area briefly after installation. Scrape off excess adhesive with a card, set aside, and allow 24 hours to fully cure before use. [Wide Application] Designed for use with all types of inflatable surfboards and most kayak models. Weight: 100g/piece Color: Black Material: PVC Size: 21 x 6.5 x 6.4 cm Package Contents: 2 x Water Dividers Note: Light and display differences may cause slight color variations between the image and actual item. Measurement may vary by +/- 1-3 cm.