Zing Z Ammo 10 units Extra Bounce Back Whistle Arrow Refills New Open Box WHISTLING ACTION: The embedded whistle allows you to hear the arrows screaming through the air as they zoom towards your target AWARD WINNING TOY FOR SUMMER: Great way to enjoy the outdoors all summer long; shoot targets in your backyard, team up and have a battle in the park, see how far you can shoot while you’re at the beach SET INCLUDES: 10 Green Zonic Whistle Arrows (Bows sold separately) Compatible with: Zing HyperStrike Bow, HyperStrike Donimator Bow, Firetek Bow, Z-Tek Bow, Z-Curve Bow and Z-Bow