3.15 mil (80 microns). STRONGER THAN REGULAR POLY MAILERS. ------------ White & Black dots poly mailers / Thank you poly mailers / Poly bags. 25 pcs / Unpadded 10"x13" inch (inside) Perfect to ship clothes, shoes, handbag or other light products Waterproof & Resistant No tag because I import them. *If you need + or - qty, ask me Please see my other poly mailers / bubble mailers / bubble envelopes / thank you cards / thank you stickers / tape / Washi Tape and much more... Thank you for shopping in my boutique and closet & support my small business! Nathalie, from Colicad