These straw hole lids are made of tin plated steel with a plastisol lining. The straw hole is 8.7mm, which will fit most of our straws. You can choose from our stainless steel, glass, plastic, or paper straws. You can choose to use them with any size Mason jar that has a regular mouth. Half pint jars are great for kids or for cocktails, and pint or quart jars are perfect for water, soda, juice, iced tea, or whatever you feel like sipping on. They are perfect for everyday use or for parties or weddings! You can put them in the dishwasher but we recommend hand washing and drying to prevent rust. We have found these lids to be more rust resistant than most of our patterned lids. Note that jars and straws are sold separately.