I've been using this for about six months, but I no longer plan to use it, so I'm putting it up for sale. I've been storing coffee beans in it, and there's no discoloration. The air extraction function works perfectly. Please understand that this is a used item before purchasing. Brand: BelleLife Color: Black Material: Glass Features: Food Grade, BPA Free, High Vacuum Capacity: 550 milliliters Product Dimensions: 10.2 length x 10.2 width x 10 height cm