The All-Clad 0.5 Qt Butter Warmer features premium tri-ply construction for even heat distribution without hot spots, starburst finishing on interior for superior stick resistance, comfortable stainless steel handle, and 18/10 stainless steel cooking surface that will not react with food. Compatible with all cooktops. Oven and broiler safe. Dishwasher safe. Handcrafted in the USA.