K'NEX K-FORCE K-20X Building Set (165 Piece) (Amazon Exclusive) 165 PARTS  The KNEX K-FORCE K-20X Building Set includes 165 KNEX pieces that kids can combine to build four different target and blaster models. This set contains KNEX rods and connectors, plus special parts to create different exciting dart weapons: one blaster chamber, two skull dart holders, one quick-fit grip, one preload ring, and five foam darts. BUILD, CUSTOMIZE, BLAST  The K-FORCE K-20X Building Set lets kids design and create the blaster of their dreams. Unleash kids artistic side by letting them create their own dart blasters. Theyll broaden their imaginations as they transform the main K-20X model into three alternate modes. This K-FORCE Build and Blast set lets them shoot five foam darts up to 75 feet! DOWNLOADABLE INSTRUCTIONS  KNEX K-FORCE K-20X has easy-to-follow step-by-step building instructions for the three alternate blasters and target figures that can be made from the same set. With the array of models kids can build, this toy is designed to give kids a more exciting and mentally stimulating playtime. Youngsters will soon be assembling complex structures by themselves! MULTIPURPOSE  The K-20X Building Set is compatible with the entire K-FORCE Build and Blast line. Use the K-20X Building Set in combination with other KNEX sets to build even bigger blasters and targets! K-FORCE dart blasters were designed for durability  special rod-locks included in the set help the parts stay together during the heat of battle! STEAMagination  This is the connection of STEAM (science, technology, engineering, arts & math) with a childs natural curiosity and creativity, and it powers the fun of each and every KNEX building set. Building with KNEX puts children on a path to a fundamental understanding of STEAM / STEM subjects. CUSTOMIZABLE BLASTERS  K-FORCE Build and Blast is the only line of dart blasters that you design, build and fully customize! Specialized parts like quick fit grips and dart launching mechanisms combine with the K'NEX building system to create any blaster that you can imagine. Packaging may vary. COMMITMENT TO QUALITY  KNEX rods and connectors are responsibly made in America at a landfill-free, zero-waste green manufacturing facility in Hatfield, Pennsylvania. We test to the strictest quality and safety standards, ensuring that your child has a successful, trouble-free building experience. PARTS GUARANTEE  Broken part? Missing part? If you need a replacement for any reason, just give us a call! Well get you what you need so that your child can get back to building as soon as possible.