Two replacement straw tops – especially for the b.box insulated drink bottle. Dishwasher safe. BPA, Phthalates and PVC free Note: This straw top will only fit b.box insulated drink bottle both 350ml and 500ml. 2 replacement straw tops for the insulated drink bottle Dishwasher and steriliser safe BPA, Phthalates and PVC free Straw top made from silicone.