EZDIVE Hi-Viz 6.5" Wide Scuba Diving Surface Marker Buoy (SMB) 400D Polyurethane Coated Nylon,Yellow Open bottom for regulator fill,easily inflated at depth Light weight 0.46 LB, 6.5 inch wide 43 inch tall Comes with reflector marking for night diving Handle on top for name slate or light stick when night diving Durable 400 denier polyurethane coated nylon material, binding taped