Package Sealing ClipMATERIAL: Made of PP. Selection of non toxic and strong odor free material, which does no harm to you. EASY TO USE: It is easy to open and close, and easy to store, barrette style design makes them securely closed. And the clips will not snag or tear on the plastic bags. UNIQUE DESIGN: It comes with a guide, and you can attach it directly to dog or cat food or flour bags. While sealing, you can open the lid and pour out the food when needed, which is