Thunder Group 12-Pack Tenmoku Collection Soup Bowl, 6-3/4-Inch Diameter, 18-Ounce TheTenmokuDonburi Soba Bowl (5770TM) is part ofThunder Group'sTenmoku Collection This commanding collection willadda distinctive elegance to your dining experience Each piece in this collection is made of melamine, a durable, break-resistant, non-toxic and heat-resistant plastic Melamine can withstand temperatures from 32DegreeF to 220DegreeF (0DegreeC to 120DegreeC) Melamine is non-microwaveable, but is dishwasher safe (highly recommended for low temperature, top rack only)