After opening, you can securely fasten the bags mouth. Easy to grab and hang on a hook. Convenient food storage. Recipes and notes are also OK. Material: Body: ABS resin, Springs, Stainless steel. Note: Cannot be sealed. If you hang heavy objects with a clip on it, it may fall off. Do not use in the microwave or freezer. Please do not place near fire or in high temperatures. This may cause the product to soften or deform Please be careful not to let small children touch this product. Please do not use for anything other than the intended purpose.