The materials I ordered came through very quickly in perfect condition as per usual, Hobart's is the only place I have found to be worth buying laser engraver materials from always great prices
So pleased with the service and the product.
Thickness tolerances for Perspex® are as follows:
Perspex® Clear Cast Perspex® CC (continuous cast)
+/- 10% plus 0.4mm 2mm +/-10% 3mm to 10mm +/- 5%