Cork wads are placed under the shot bringing the load up to perfect crimping height. Cork wads are light, dense and very flexible - great for smaller pellet sizes. Cork wads can be stacked to accomodate any height requirements. Use 12 gauge cork wads inside 10 gauge shotcups and 20 gauge cork wads inside 12 gauge shotcups. Cork wads can be used in place of other filller wads but are not to be used directly on the powder.