Non-Toxic & Food Safe MaterialOur mixing bowl is made of food-grade material,BPA-and odorless,ensuring the absolute food safety in prepping,washing,baking,mixing and serving. (Temperature Resistance: -20℃~90℃/-4℉~194℉) Stackable Design & Space-Saving4 piece nesting mixing bowls enhance ample capacity,sets includes 1.7qt bowl,2.5qt bowl,3.5qt bowl and 4.5qt bowl.