Sold as a pair. Can be mounted directly to Drysuit. Make sure hand is relaxed. Take measurement around the wrist bone to capture widest measurement. Can be trimmed to fit. Highly flexible and has a long lifespan. Manufactured with quality Latex rubber material Always rinse latex products with fresh water after each dive - to remove sand and prevent salt crystals to form. The best care for all latex products that are exposed to oil, human body fat and sweat is to wash thoroughly in lukewarm soap water, rinse and dust with talcum powder. Avoid heat and sunlight exposure. Store in a dark and cool environ ment. These high quality latex Manchette seals are the seal of choice when it comes to commercial and rescue team divers. The seals are double dipped, provide superior wrist mobility and excellent durability for the harshest environments. Replace a leaky seal to maintain a warm, dry and safe suit - don't let a leaky drysuit ruin your dives! This high quality, inexpensive replacement part can have your suit working like new!