Kids can build six different toy blasters and target models with this 335-piece K’NEX set, including the double-chamber mega boom blaster! They’ll enjoy playing with the K-FORCE Mega Boom Building Set along with their friends. Your kids can aim their target as far as they want with the models they build, which fire up to 75 feet! The K-FORCE Mega Boom Building Set includes K’NEX rods and connectors, plus special parts to create customized blasters: two blaster chambers, three skull dart holders, two quick-fit grips, two preload rings, and seven foam darts. In addition to the main mega boom blaster, you can download instructions for five alternate blasters and buildable targets for added fun. Each STEAM toy you make is exclusively designed for a more exciting playtime. K’NEX educational models offer proactive opportunities that encourage children to use their creative juices by building their own dart blaster or toy gun. Get your kids away from the computer screen and let them create real working models that stimulate the brain and promote safe, active fun. The Mega Boom Building Set is compatible with the entire K-FORCE Build and Blast’line. Kids can use the Mega Boom Building Set in combination with other K’NEX sets to build even bigger!. K-FORCE Build and Blast’is the only line of dart blasters that kids design, build, and fully customize! Specialized parts like quick-fit grips and dart-launching mechanisms allow kids to create any blaster that they can imagine. With K-FORCE Build and Blast Mega Boom Building Set, allow your kids to create and play with their young STEAMagination.