Three engine hook sizes come in one pack.
303143 - Engine Hook Accessory Pack Description Hooks fit mini engines (one), regular and 'D' engines (three) and 'E' engines (two). Also includes spacer for 'E' engine hooks.
Additional Information & Technical Specifications:
Estes model rocketry is recommended for ages 10 and up with adult supervision for those under 12. Unless otherwise specified, all models require assembly.
Tools, construction and finishing supplies sold separately.
In order to launch, a launch system, model rocket engines, starters and recovery wadding are required - sold separately-unless otherwise specified.