Box of 7 - diameter 1 3/8in.;, 1 3/4in.;, 2 1/8in.;, 2 1/2in.;, 3in.;, 3 3/8in.;, 3 3/4in.;. Exoglass is a nonporous composite material which is temperature resistant up to 430 degrees Fahrenheit. Dishwasher safe and can be sterilized. Matfer Bourgeat Exoglass is a nonporous composite material which is temperature resistant up to 430 degrees Fahrenheit. Dishwasher safe and can be sterilized.