Oasis floral foam designer sheets are available in a wide range of sizes. Oasis floral foam designer sheets are large sheets of backed oasis floral foam, designer sheets are ideal for cutting into any desired shape. Cut designer boards easily with a florist knife, florist knives can be found in the floralsundries.com florist supplies department. Master boards and caskets are used for creating large casket tributes or flower arrangements. Caskets and master boards are also commonly used for table decorations and function flowers.