K'nex Education Intro to Simple Machines Levers & Pulleys Set Microsoft Surface Accessories You can use a 20mm

You can use a 20mm width band with:

so you can enjoy a restful night’s sleep with family and friends

making snapshots

Or blast through your music library at your friend’s place

Horn pieces require assembly

K'nex Education Intro to Simple Machines Levers & Pulleys Set Microsoft Surface Accessories You can use a 20mmIncludes 178 colourful parts to make eight different replicas of real world simple machines Accommodates 2 3 students working as a team and appropriate for elementary classrooms in grades 3 through 5 STEM Concepts: making work easier, mechanical advantage, effort arm, fulcrum, lever classes, pulley systems and more Packaged in a reusable plastic storage tray with a snap on lid for quick clean up and easy storage Building with K'NEX puts children on a