The set contains ten 25mm-thick optical acrylic prisms: – Equilateral triangle 75 mm sides – Equilateral triangle 57 mm sides – Isosceles 90º – 71 mm hypotenuse – Scalene 90º 78 mm hypotenuse – Rectangle 75 mm x 50 mm – Semicircular 75 mm – Biconvex 75 mm – Biconcave 75 mm – Plano – convex 75 mm – Plano – concave 75 mm