Toddler cups are made of premium 18/8 stainless steel with food grade silicone straws and BPA free plastic lids.Unbreakable & Reusable.No metallic taste and wont rust for long service life.With silicone straws that are soft to bite down on but resistant to tear, wont hurt your teeth or lips, comfortable sips and safe for all ages.These Kids cups with airtight buckle and vacuum insulated double wall design can keep the drink hot or cold for hours.Ideal for water, juice, milk, smoothies, hot chocolate and etc.