Below is a group product of Engineering Grade.
Product List
"YSL"1100 Series (High Intensity Grade (PC))
Feature: Long service life, high reflectivity. ...
[Last Updated: 2009-10-02]
"YSL"5200 Series (Engineering Grade (PET))
Feature: Untear able, good reflectivity, easy operation, can ...
[Last Updated: 2009-10-02]
"YSL"5100 Series (Engineering Grade (Acrylic))
Feature: Good reflectivity, and could be tear, good ...
[Last Updated: 2009-11-16]