Features: 【High-Strength Aluminium Alloy】Crafted from premium aluminium alloy, delivering exceptionally durability and resistance to deformation. 【Precision Graduation Design】Fine-scale markings ensuring accurate measurements, effortlessly handling both geometric drafting and everyday tasks. 【Multi-Functional Combo Set】Includes four tools such as rulers and set squares to meet diverse measurement requirements. 【Safety Rounded Edges Craftsmanship】Each ruler features rounded corners to eliminate the risk of cuts from sharped edges. 【Lightweight and Portable】Compact design easy carrying, ready for any learning task at a moment's notice. Specifications: Component: aluminum alloy Craft: Fine polishing process, smooth surfaces without burrs, comfortable feel, prevent scratches. Length about 15cm/5.9in Colors: Optional Package Includes: 1PC Ruler 2PCS Triangular ruler (Specifications: 45 degrees and 60 degrees each) 1PC Protractor (Specification: 180 degrees) 1PC Instructions for use (Bilingual Chinese and English) note: There might be a bit color distortions due to different computer resolution There might be size errors due to different computer resolution