MATERIAL The durable tumblers are made of plastic and stainless steel with silicone straws Longlasting and BPA free the lids and plastic tumbler are top rack dishwasher safe while the stainless steel tumbler should be hand washed Do not microwave SIZE The set contains two tumblers and one additional sipper and straw The plastic tumbler has a capacity of 15 ounces and the doublewall stainless steel tumbler has a capacity of 12 ounces LEAKPROOF DESIGN Each silicone straw has a builtin valve that allows liquid to flow when drinking and prevents accidental spills when the tumbler is tipped over The straw is also soft and comfortable for kids to drink from AT HOME OR ON THE GO The straw tumblers are suited for travel since they wont leak while keeping drinks easily accessible Theyre also great for drinking beverages at home without worrying about spilling on papers or electronics LIFESTYLE Zak Designs drinkware makes hydration a fun part of your daily routine These Mickey Mouse tumblers are great for kids just graduating from sippy cups The tumblers are fully reusableno more disposable cupsand you can choose the material that best suits the situation