Made from a natural waste by-product of rice milling ? a renewable, biodegradable and sustainable resource No melamine, no plastic, no BPA, no toxins, tree-free. Biodegradable yet durable, stain resistant and dishwasher friendly. Can be reheated in the microwave. Using the outer hull of the rice grain, a natural and robust material that would otherwise be burnt in the fields, huskup is harnessing an abundant waste product and giving the planet a helping hand ? even before the first coffee is poured.