4" X 8" 4-mil Clear Resealable Zipper Shipping Poly Bags (Qty=100) 100 4" X 8" 4-mil Clear Resealable Zipper Shipping Poly Bags Clear see through heavy duty 4mil thickness Zip style closure at top Use for tools, parts, heavier items, some sharper items, office First quality; 4 mil thickness; stronger, firmer