Housewares International Reactive Glaze Stoneware 13-oz. Jumbo Mug with Metallic Rim, Brick Red One (1) 13oz. reactive glaze stoneware jumbo mug with metallic rim, brick red Stoneware with reactive glaze finish Stoneware with reactive glaze finish. metallic rim. Dishwasher safe and microwave safe Highest quality materials brought to you by housewares international inc.