Fabric quality

There are 2 versions in ceiling projection screens:
1. A regular in-ceiling projection screen, called the In-ceiling range
2. And a version with side tensioning, called the tensioned in-ceiling range

Which are the differences between the 2 models:
Maximum top border height: Regular: 40 cm / 16 inches Tensioned: 80 cm / 31.5 inches
Case width: regular: viewable image + 25 cm / 10 inches Tensioned: viewable image + 50 cm / 20 inches
Tensioning: regular: horizontal tensioning only Tensioned: horizontal and vertial tensioning