These 12 Mil Clear Plastic Reclosable Zip Poly Bags with Resealable Lock Seal Zipper are perfect for small parts storage, crafts, and more. They are made of high-quality plastic, with a thickness of 12 Mil + 12 Mil (0.3mm + 0.3mm), making them incredibly durable and strong. The bags are non-toxic, odorless, acid-free, and food-grade safe, making them safe for long-term storage. They are also reclosable and heavy-duty, making them suitable for long-term use. The bags come with a resealable lock seal zipper, which ensures that the contents are securely sealed and protected.