The Helix Value Maths Set contains essential tools for school pupils and students studying maths subjects. This Maths Set is indeed great value for money as it includes: 15cm Ruler 180° protractor 45° and 60° Set-square Self-centring compass 90mm pencil Sharpener with an anti-tamper screw Eraser. The Helix Value Maths Set is perfect for school children or students studying a range of subjects including maths, geometry and trigonometry.