B. Box PPSU Sippy Straw Cup with HandleDescription B. Box's award winning sippy cup has been redefined with a long lasting, medical grade PPSU base. PPSU stands for Polyphenylsulfone, the safest & most durable material for baby bottles. It is is perfect for high levels of usage. PPSU is a medical grade plastic thats incredibly hard wearing. Its a very safe plastic and is the highest standard for baby bottles. PPSU is lightweight and temperature resistant up to 180 degrees Celsius without
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