Samadoyo 450ml (15.2oz) Borosilicate Glass Tea Cup With Silicone Sleeve and Stainless Steel Filter (Taupe) PROFESSIONAL HAND MADE GLASS CRAFTMANSHIP - This is a very UNIQUE design you won't find anywhere else, created by seasoned glass artists who are masters at their trade. This bottle is made from ULTRA CLEAR BOROSILICATE GLASS, the most durable composition of glass made for cookware. It has a low expansion rate, which reduces material stresses caused by temperature gradients, thus making it more RESISTANT to breaking. Silicone sleeve provides insulation to cup and protects hands when drinking Stainless steep strainer keeps tea leaves inside cup when drinking Choose from three available sleeve colors: taupe, green, and grey