This is the Highland Technical Signal Marker Buoy Features: Closed bottom design - 45 in. (114 cm) length x 10 in. (25.4 cm) circumference. The stainless-steel tipped inflator allows oral or QD hose inflation. 2 (5 cm) wide SOLAS reflector tape all the way around. 2" x 4" (5 x 10 cm) white panel at the top to write on with a permanent marker. 1.5" (38 mm) over-pressure valve with pull cord for easy deflation and roll-up. 1" (25 mm) plastic attachment D-ring at the top. Rebreather, extended range, and sidemount divers have different requirements for a DSMB than recreational divers. From the heavy-duty 420D nylon fabric to the over-sized stainless attachment D-ring on the bottom, this DSMB is a quality product purposefully designed with the technical diver in mind."