Halcyon Super Slim Divers Alert Marker 6'6' (1.8 m) long, (15 cm wide)Slim inflatable diver alert marker designed for clear surface signalling during dives, made from 200 denier nylon for durable visibility and abrasion resistance. The 6. 0 ft marker includes an integrated over pressure relief valve for safe deployment from depth and Halcyon's No Lock connector for simple inflation at depth. Lightweight when deflated and compact for thigh pocket or backplate storage, it supports multiple color combinations for position