This set of 2 Catit PIXI Ice Packs was specifically developed for use with the Catit PIXI Smart 6-meal Feeder. While the feeder itself already includes a set of ice packs, having an additional set handy allows you to easily place a newly frozen pair on a daily basis. Before use, simply keep the Catit PIXI Ice Packs in your freezer overnight, or until thoroughly frozen, which takes up to 12 hours at 25 to -11 degrees Fahrenheit (-4 to -24 degrees Celcius). Insert the Catit PIXI Ice Packs in the designated space underneath the feeding tray of the Catit PIXI Smart 6-meal Feeder. Doing so will help keep the cat food inside fresh and cool for longer. Please ensure not to put the feeder down on top of heated flooring when using ice packs. Dimensions: L. 28.5 x W. 14.5 x H. 1.5 cm (11.2 x 5.7 x 0.6 in)