The Dart Zone Pro Series roster brings top-tier performance and power, right out of the box. Now, players can bulk up their pro-level buildout even more with a set of backup half-length dart cartridges. The Dart Zone Pro Series MK 2.1 Half-Length Dart Cartridge 4-Pack keeps players from wasting time refilling when they should be getting in on the foam blaster action. Fill each included cartridge with 6 Dart Zone Bamboo 2.0 half-length darts for endless gameplay on the field. And with the MK 2.1’s innovative bottom-loading feature, refilling your Pro Series dart blaster has never been faster. Forget the speed-loaders — these cartridges can be inserted straight into the bottom of the blaster handle. This Dart Zone cartridge 4-pack is recommended for players ages 14 and up and is available on Amazon. Darts not included.