Styletext align justifybuild an impressive 6 different blaster and target models in one set including the double chamber mega boom blaster fires up to 75 feet set includes 335 knex parts including rods and connectors plus special parts to create customised blasters 2 blaster chambers 3 skull dart holders 2 quick fit grips 2 preload rings and 7 foam darts in addition to the main mega boom blaster you can download instructions for 5 alternate blasters and buildable targets compat