UST ParaKnife 4.0 Pro The UST ParaKnife 4.0 Pro has a durable four-inch-long, four-millimeter-thick stainless steel blade and is a handy knife to have on the trail. The sawtooth blade adds maximum cutting functionality, and the black-oxide finish reduces rust and protects the blade. The wrist lanyard features an integrated whistle for an easy-to-use signal device. A protective sheath for safe storage is included. ParaTinder Handle: The ParaTinder handle wrap provides secure grip in all weather conditions and unwraps to provide around six feet (1.8m) of paracord with an added single tinder thread. To ignite ParaTinder, expose red core thread and light with included fire starter. Inner paracord strands can be used as sewing thread, sutures, fishing line and more. Flint Fire Starter The flint fire starter produces sparks even in the worst conditions. Lightweight and compact, it is easily stored in the included protective sheath.