COMPLETE BOXES OF 450 UNITS FOR SALE. If you need to buy heart-shaped formats to present your Valentine's cakes, we have the largest variety on the market, including the individual format for small cakes. Our heart formats are made with Coated White paper and gold metallized polyester. Depending on the size, the weight of the formats ranges between 950 and 1,050 grams/m2. They are 100% recyclable and grease-resistant. The gold polyester does not migrate to food.