With affordability as the key component for this type of quality, we use the top, medium and substitution grade rough.  An interesting variety of fancy cuts plus other services such as drilling of holes, laser embossing and more are also offered.  Colour inconsistency is fair (3-4 shades). Size tolerance ranges from +/-0.10mm to +/-0.20mm, +0.20mm, -0.10mm depending on shapes and sizes.  Height tolerance is +/-0.30mm.