3" X 4" 4-mil Clear Resealable Zipper Poly Shipping Bags (Qty=100) 100 3 Inch X 4 Inch Clear Resealable Zipper Poly Shipping Bags Clear see through heavy duty 4mil thickness Zip style closure at top For tools, parts, heavier items, office supplies, extra fragile items First quality; much stronger than the average 2 mil bags