Contains a total of 225 sheets (75 per pack) — enough for about 54-75 flights. Required in most Estes rockets unless they are tumble recovery. Recovery wadding is installed in between the motor and the parachute and is designed to prevent damage to the parachute. Plastic parachutes can singe or melt when exposed directly to the ejection charge from the motor, but recovery wadding is designed to take the brunt of that ejection. Depending on the motor you are using, a few to several sheets are recommended - refer to your rocket's assembly manual for the recommended number of sheets.