The Black Diamond Big Air package is a quick and easy way to get a new belay set-up. Whether youre new to the sport, or replacing old gear, the Big Air package is a great way to get the gear you need. You get a Black Diamond ATC belay device, which is one of the most popular and easy-to-use devices on the market. And because you need to use a locking carabiner to attach the ATC to your harness, the package also includes an Airlock2 Screwgate locking biner. Comes in assorted colors.