The Winchester Super-X blank cartridge comes in both 10-gauge and 12-gauge sizes measuring either 2 7/8 inches or 2_ inches respectively. These blanks feature a clean-burning powder and Winchester's famous 209 primer to ensure reliable ignition and velocity with each and every round.If you are in the market for a top-quality training blank look no further than the Winchester Super-X blank cartridge. Even though they are blanks these rounds are still an excellent example of Winchester's commitment to quality and 140 years of experience in the ammunition industry.