Pot set induction saucepan set series wmf astoria material stainless steel lid material heat resistant glass handle stainless steel material properties scratchproof dishwasher safe features with lid lid features viewing window lid gesundheitshinweis rustproof shape round suitable for gas cooker induction hob ceramic glass hob halogen cooker oven electric cooker manufacturer specific features transtherm universal base comprising saucepot saucepan cooki