These lids screw on and the cups are made to fit in a cup holder with a 7.5cm base. They are huge, hold 40oz and will keep your drinks hot or cold all day long! The lids twist to use with a straw or to expose the sip style hole.

These are double walled insulated stainless steel tumblers.

Comes with 40oz Tumbler of Your Choice, Lid, Plastic Re-usable Straw, Box