Perfect gift to give to that special teacher! These are 16oz double wall acrylic tumblers. Made from high-grade 100% BPA free acrylic plastic, this tumbler is durable and ideal for everyday use. Comes with a secure twist-on lid with an inner seal ring (to prevent leakage), and matching reusable plastic straw with slip stopper.Please note: these tumblers are to be hand-washed only! They are not dishwasher safe, microwave safe, and they cannot soak in the sink.