Feature Highlight Description Zero Stain Absorption Non-porous opal glass surface blocks coffee stain absorption — the cup interior stays white after years of daily use. Easy Daily Cleaning No more brown buildup that ceramic mugs develop over time. A simple rinse keeps this tempered glass cup spotless. Durable for Home & Café Lightweight, chip-resistant opal glass cup and saucer — dishwasher safe and microwave safe for home or café use.