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:

making snapshots

Horn pieces require assembly

their friends or siblings to see who can get the ball to the top or bottom of the spiral first

Makes a great gift for ages 4 years old and up especially those who love

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