A4 envelopes for marking electronic components, PC boards, assemblies and more For laser printer use DIN A4 laser labels type I (rounded corners) available in the following materials: (PS) polyester, silver; (PW) polyester, white DIN A4 laser labels type II (square corners) available in the following materials: (PFY) polyamide fabric, yellow; (PS) polyester, silver; (PW) polyester, white; (PG) polyester, yellow