The bowls are made of durable, lead-free glass that is easy to clean and resistant to scratches.The five different sizes are perfect for various tasks, from whipping cream to mixing batter. The included lids make storing and refrigerating mixes a breeze. Easy to clean;The glass bowls and lids are dishwasher safe, making cleanup a cinch! Overall, these JoyFul by JoyJolt mixing bowls have become my go-to kitchen essentials.