A.High quality and Eco-friendly (It's a kind of borosilicate glass that resists heat,abrasion&corrosion. Prolonged use remains transparent as new, Minus 20 degrees to 150 instant temperature difference, Can use a microwave oven to heat or flame. Perfectly adapted to modern life) B. Transparent and Practical ( Glass surface is smooth and delicate, does not adsorb odors and easy to clean, Brim open, relaxed and natural extracts, the size is perfect for a hand grip )