Neck entry wetsuit neck rings, set of 2. Size: 35cm neck circumference. These were included when I purchased a new wetsuit about 6 years ago. Neither of them are double (fold-over type), so they might not be suitable for mid-winter in cold regions. They might be good for use as an inner neck. The larger one has a small chip in the rubber (see photo 4). No individual sales. Instant purchase OK.