Neutral Buoyancy Spool
It stays in neutral buoyant even after slipping out of the hands.
Concave Side, 10 Hole Cross Ways
Easy to Clip a double-ended bolt snap as the holes on each side locates slightly differently. It designed to wind longer line.
Anti-ware Luminous Line
The line is hard and negative buoyant which prevents entanglement or twist. The luminous line is useful in cave or wreck dive or when the visibility is not good.