Frost Form - The Round KitFrost Form is a revolutionary patented product that allows you to Frost your cakes to perfection in minutes. What size kit should I buy? : For a 6" sponge cake, you'll need a 6" kit. Each kit includes a crumb cutter to trim your cake, ensuring it fits perfectly into the Frost Form with enough space for your frosting. Click here to see How it works! You can use buttercream, ganache, chocolate biscuit cake, Jell O, cheesecakes, ice cream, and more with