Felli loc-tite canisters feature an easy open and close ring that allows you to open and close securely with 2 fingers. Flip ring up to open and flip ring down to seal. They are made of a durable, shatterproof acrylic and a 100% silicone seal that makes them airtight. Clarity of canisters allows you to easily view what is inside. These stackable BPA free canisters are a great way to get your cabinets and pantry shelves organized and great for keeping your foods fresh. Base of containers is top rack dishwasher safe. Keeps dry foods fresh, stackable, space saving.