SoHo Coffee Mug with Warmer This year, give the gift of hot coffee with this unique and heartwarming gift for grandmas! The 12-ounce mug is made of durable new bone china and is dishwasher safe, with a printed design and wide, comfortable handle. Included is a 3.5" electric warmer to keep that cup of joe at the perfectly sippable 140 degree temperature. Whether for tea, coffee, or soup, this mug and warmer is a total gamechanger for the grandma who loves to linger over a warm cup. All SoHo products arrive gift boxed and are backed by our Lifetime Satisfaction Guarantee.