B-837 is printed paper sealed in a write on matte finish polyester pouch with a 3/8 in. grommet. Write-on polyester laminate protects the graphics, wipes clean and withstands water, grease and extreme temperatures. Durable heavy duty polyester material exceeds OSHA's 50 lb pull force requirement. The write-on matte finish allows workers to personalize tags with pen, pencil and marker. Excellent chemical, oil and water resistance.