The WP-Series Charges are constructed from spiral fibreboard tubes with a fibreboard base-plate, and a paper top-cap. The casing contains pyrotechnic star and propellant compositions. Electric, or shock-tube, igniters are factory installed. Lead wires, or shock-tube, protrude from the base-plate end of the tube.
Charge designation / effect variations are as follows:
- WP001: soft report and propulsive effect; Dense puff of white smoke. Expansive burst of yellow stars, with white smoke trails for a 10 metre radius. Stars continue to burn for short period while on the ground.
- WP002: soft report and propulsive effect; Dense puff of white smoke. Expansive burst of yellow stars, with white smoke trails for a 20 metre radius. Stars continue to burn for short period while on the ground.