JBL Flex Semi-Dry Dive Snorkel Swimming Fins It was developed by dentists

It was developed by dentists and dental laboratories and lasts longer than any other mouthpiece because only a minimum effort is needed to hold it comfortably in place

This particular model uses a percentage scale

For diving in warm tropical water

5/8" and 11/16"

JBL Flex Semi-Dry Dive Snorkel Swimming Fins It was developed by dentistsThe flexible lower and contoured upper make this the perfect general purpose snorkel. The flexible lower and contoured upper make this the perfect general purpose snorkel. Protected bottom purge valve allows for effortless clearing and soft mouth piece helps reduce jaw fatigue during long dives.