A clear biodegradable plastic flat straw slot lid fof the 9-20oz biodegradeble cold cup, made from PLA these lids are biodegradable and compostable. They have a slot or hole for a straw to be pushed through, cups are available for these lids separately. Ideal for fruit or milk based smoothies. There is also a 3oz insert which fits in the top of the cups to offer other uses such as yogurt and granola.