Used for normal to heavy mixtures such as cakes, frostings, cookies and mashed potatoes. The flexible edge design guarantees faster mixing, without stopping the motor and using a spatula to scrape the sides. Coated metal with silicone side. Dishwasher safe. Only compatible with the following stand mixers: 5K45SS, 5KSM45, 5KSM95, 5KSM125, 5KSM150, 5KSM156, 5KSM175, 5KSM180, 5KSM185.