Hollis Compact Orange Closed Cell Signal Marker BuoyThe Hollis Compact Orange Closed Cell Signal Marker Buoy is a reliable component of scuba and diving gear, designed to mark your location on the surface during safety stops and mandatory decompression stops. It provides a visible signal to the surface boat if you surface away from the dive boat. Constructed from closed cell foam for buoyancy, it maintains shape in challenging conditions and offers a compact profile that fits neatly in a dive kit.