Our cookie cutters are primarily made to cut fondant, however can be used to cut cookie dough, fruit, sandwich bread etc. They are made out of PLA plastic which is biodegradable and good for the environment. The sizes listed pertain to the approximate length of the stamp. The 4 inch size is displayed. This cookie cutter has a depth of 1/2 an inch. All other sizes are directly proportionate to this size. These items are NOT dishwasher safe. HAND WASH ONLY WITH COLD WATER. Prolonged exposure to moisture and direct heat/sunlight should be avoided.