Ecooe Clear Glass Tea Mug Cup with Stainless Steel Infuser Lid for Loose Tea/Tea Bag 17 Ounce 18/8 Stainless Steel Filter: Ultra-dense filter keeps any residues from escaping to your tea. Made of 18/8 stainless steel, the filter is durable and will keep its form for years to come. For Cold and Hot: The Glas Mug can withstand instant temperature change from minus 30  to 150. It will stay intact even if you fill boiling water into the frozen teacup instantly. 500ml Capacity: Enough to provide roughly 1 mugs of water. We recommend 400ml water for optimal use. Easy to Clean: Being comprised of three detachable pieces, the cup can be disassembled and cleaned in an easy and thorough way. Warranty: Ecooe 500ml Glass Tea Cup, 18-month hassle-free warranty and our friendly customer service. All glass articles are brittle, so be careful with this teacup when using or washing.