The smoothly folding mechanism with rounded edges ensures seamless operations and enhanced, while the precisions markings provide accurate measurements up to 30cm when fully extended Crafted from a premium aluminum alloy and resin composite, this folding ruler combines durability with lightweight portability, featuring an innovative foldable design for compact storage and easy transport Featuring a surfaces and ergonomic grip, this multi functional ruler supports STEM learning activities while maintaining structural integrity through repeated folding cycles Ideal for classroom geometry lessons, homework assignments, or DIYer craft projects, its double length functionality ( 15cm folded / 30cm extended) adapts to textbooks, art boards, and outdoor explorations Designed specifically for students, this child friendly measuring tool prioritizes with edges and folding button suitable for small hands, Manufacturer: ZYKEJJDDAK