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【Product Specification】 ➤ Name: 4 Packs Math Geometry Tool ➤ Package Size: 17cmx8cmx0.5cm ➤ Items weight: 50g ➤ Product material: Aluminum alloy 【Product Features】 ➤ Laser etched ensure Never Fade or Rub off during use, Easy-to-Read Laser Etched Increments. ➤ Strong Durability, can be used for any Occasion, Such as Life, Learning, Work, Experiments etc. ➤ Whether you're an architect, engineer, student or you just need to make precise measurements or drafting, these well-crafted specialized tools get the job done. 【Set includes】 ➤ 1 Straight Ruler 15 cm ➤ 1 Protractor 180' / 10 cm ➤ 1 Square 45' degrees - 6cm x 10cm ➤ 1 Square 30' degrees - 6cm x 10cm 【Caution】 ➤ Although the sharp corner of the scale ruler are specially treated to prevent injury, it is also Not suitable for children under 3 years olds