OMS SLIM Big Divers' Alert MarkersSLIM Big Divers' Alert Markers This OMS 6 foot 1. 8 meter SMB is designed with an open bottom allowing the diver to inflate it using the using the second stage of a regulator or other methods. This SMB is a standard piece of gear for divers performing drift or decompression dives. Features: Easily inflated at depth Extreme visibility Maximum size available in the OMS SMB line up Before using this equipment, divers are recommended to seek instruction