These daisy lids are made of galvanized steel. This means the cutout edges are raw steel, which rusts. If you plan to use them outdoors, you should consider our stainless steel daisy lids. The straw hole is 6mm, which is smaller than our straw hole tumbler lids. We carry 6mm stainless steel reusable straws and biodegradable paper straws. You can choose to use them with any size Mason jar. 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. Paired with a straw, they are perfect for everyday use or for parties or weddings! They also make great lids for candles, potpourri, and other crafts. Hand wash and dry to avoid rust. Bands, jars, and straws are sold separately.