This is a set of two Inon Quick Shoe Bases. They have been used underwater more than 10 times. The O-ring is chipped, so replacement is recommended before use. *This is a used item. Please refrain from purchasing if you are looking for the same quality as a new item or if you are sensitive to imperfections. Please read the profile and only purchase if you understand and agree to the terms. We look forward to your purchase if you understand the above.