Reclosable tab retains your beverage's heat in between sips Secure-fit design reduces any chance of spills for safe use Designed for Dart 12J16, 14J16, 16J16, 20J16, 24J16, 12X16 and 14X16 cups Also for 16X16, 20X16, 24X16, 12U16, 16U16, 20U16 and 24U16 cups