1. Material: brass 2. Size: isosceles triangle ruler about 12.3x8.8 cmpiece, right angle triangle ruler about 12.2x7.1 cmpiece, wave ruler about 15.6x3 cmpiece, 0-15cm ruler about 16.6x1.7 cm Pieces, 0-18cm ruler approximately 18.7x2.7 cmpiece, caliper approximately 13.9x4.2 cmpiece, protractor approximately 10.2x5.7 cmpiece 3. Weight: isosceles triangle ruler is about 31gpiece, right angle triangle ruler is about 58gpiece, wave ruler is about 54gpiece, 0-15cm ruler is about 22gpiece, 0-18cm ruler is about 62g Piece, caliper about 48gpiece, protractor about 57gpiece, 4. Scope of application: daily study, office drawing, simple measurement, etc. 5. Features: solid and stable material, laser scale, clear reading, wear-resistant and durable, diverse specifications, wide applicability, smooth surface, convenient and practical