Features Put another candle on this yummy butter cake delight. All soaps contain vegetable glycerin which moisturizes the skin with a luxurious rich lather that will leave skin feeling silky smooth. Our eye-catching images make soaps visually unique, while our creative fragrances truly set our products apart. Design - Birthday Cake. Capacity - 5.8 oz. WARNING - This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.