Pneu-Dart Type ‘P’ disposable opaque polycarbonate resin body RDD Devices (color coded in yellow) are for use with our CO2/Air projectors and Blo-Jector. As with the Type ‘C’ darts, these darts are appropriate for use on small or large animals. These are the First and Only disposable Slo-Inject® RDD device on the market. 1/2cc x 1/2"