These elegant ridged mugs are the perfect receptacle for your morning tea or coffee. Crafted from hardy stoneware with a textured grey glaze, they come with a ten year guarantee.. Stoneware ceramic made from high-quality Derbyshire clay, high-fired at 1200°C for durability and strength. Vitrified glaze resistant to stains and chipping. Made in Derbyshire, England. 10 year guarantee against faulty workmanship/materials. Denby’s versatile Studio Grey range creates a casual yet impactful look, inspired by natural stones. Each Mug: Weight: 340g, Length: 13cm, Width: 9.5cm, Depth: 9cm, Capacity: 400ml. Collector’s promise: Denby gives 12-months’ notice if production of this range will discontinue. Oven, microwave, freezer, and dishwasher safe. Tough enough for everyday and stunning enough for best - Denby crockery blends beauty, versatility and durability like no other ceramics brand. Made in Derbyshire since 1809, all Denby products are still made on the same site where the pottery was founded over 200 years ago. Using high-quality locally sourced clay, all Denby ceramic is stoneware - meaning it has been fired at an extra high temperature - making it incredibly chip and break-resistant. The first UK tableware manufacturer to claim zero process waste to landfill (saving 600 tonnes of CO2 emissions every year), Denby even offers a 10-year guarantee on their beautiful stoneware. This is crockery you can take through life with confidence.