Build 4 different blaster and target models in one set with the k 20xr fires up to 75 feetr set includes 165 knex parts including rods connectors plus special parts to create different blasters 1 blaster chamber 2 skull dart holders 1 quick fit grip 1 preload ring and 5 foam dartsr in addition to the main k 20x model you can download from the official knex website instructions for 3 alternate blasters and buildable targetsr compatible with the entire k force build and blast line