This Fabri-Kal Alur Flat Lid is made from clear PET plastic and does not have a slot. It fits 9 Ounce Kal-Clear or Nexclear Cups, and 5 Ounce Alur or Pro-Kal Containers. Flat design No slot For use with 9 Ounce Kal-Clear or Nexclear Cups For use with 5 Ounce Alur or Pro-Kal Containers Temperature range of -10°F to 150°F Model #: 9508056