Keep Cups fit under the group heads of most espresso machines & they do not require heat prior to filling. Splash proof, sealable lid with plug for sipper hole. Manufactured from the safest food grade plastic; BPA free; Non-toxic. Lightweight, portable & unbreakable. Keeps coffee hot 20-30 minutes longer than disposable cups. Award winning sustainable product design. Warranted for one year, estimated to last four. Capacity 12oz Dishwasher & microwave safe.