Pouch moistner pods have been used by pipe smokers for years. They are metal and have clay medium inside. Just soak them in water (distilled is best), wipe off any excess water and you are ready to go. Use them in tobacco pouches, jars and humidors. You won't know why you didn't buy some of these years ago. They also work for herbs and cigars. These are a must have accessory for any pipe smoker. Each pod is approximately 1" diameter x 1/4" thick. You will receive 24 pouch moisteners with your order.