Pneu-Dart Type ‘U’ darts are .50 caliber and are designed to provide precise drug delivery in a convenient, inexpensive projectile. These darts are appropriate for use on small or large animals. Color coded in yellow with Flight Stabilizer, Type ‘U’ darts are used with our cartridge-fired and CO2 air projectors. Our darts contain a small explosive charge which detonates on impact and quickly injects the drug. Darts equal to or less than 1 cc do not require retention (wire barb or gelatin collar) due to the rate of injection. As a consequence of the dart mechanics, the dart will “flash” when activated, a real asset in low-light conditions. These darts come with 14-gauge cannula in length of ¾ in. These darts are equipped with a gelatin collar. Gelatin collars comprise of an inert material retaining the dart in place until the injection is made, and after several minutes will liquefy, allowing the dart to fall freely from the animal.