Clear acrylic blocks which are all 15mm thick.  All faces are fully polished. 

The set comprises 7 blocks in a storage tray as follows:

• Rectangular: 75mm x 50mm.
• Semi-circular: 75mm diameter.
• Triangular: 60° x 60° x 60°; 58mm sides.
• Triangular: 90° x 45° x 45°; 75mm hypotenuse.
• Triangular: 90° x 60° x 30°; 75mm hypotenuse.
• Bi-convex: 75mm long; Curved Faces: 100mm radius.
• Bi-concave: 75mm long; Curved Faces: 100mm radius.