These TeacherGeek birchwood strips are sourced from high-quality North American-Michigan trees. Their soft, light texture is ideal for engineering bridges, towers, catapults, Rube Goldberg Machines and other STEM | STEAM | Maker projects. Each 12-inch (300mm) strip is easy to paint, flex, glue or cut. Their dimensions (5mm x 10mm x 300mm | 12 in) match that of plastic connector strips., making them effortlessly compatible with the TeacherGeek build system. Use in DIY workshops, maker spaces, libraries, classrooms or at home - the possibilities are endless when you tinker forever with TeacherGeek.