The Helix Maths Set Advance contains essential tools for school pupils or students studying maths subjects.This quality maths set includes:. 15cm ruler. 45? Set Square with 180? protractor . Metal self-centring compass. Mechanical Pencil. 9cm Pencil. Sharpener. Eraser . Stencil timetable/ factsheet explaining what each item isThis educational maths set comes in a handy metal case and is perfect for school children or students studying a range of subjects including maths, geometry, trigonometry and design and technology.