This KNEX K-FORCE K-25X Rotoshot Blaster Building Set lets builders eight and older build a customizable blaster with rotating, five-shot action. It boasts a new RotoChamber that fires up to five darts without reloading, and each dart shoots up to 75 feet. This 314-piece builders set includes KNEX rods and connectors plus special parts to build and rebuild four additional blasters and targets. Most models can be built one at a time. This rotoshot blaster building set is compatible with the entire K-FORCE Build and Blast line.