Blue Small Poly Mailing Bags 4.3 x 7 Inch_11 x 18cm Non-Padded Envelopes Mailers
Thickness: 0.06mm for each side. (60 micron, 2.3 Mil approx.). Feature: With a strong self seal adhesive strip giving you extra security. Waterproof, tear and burst resistant. Write directly on to the material with ball point or marker pen.