Coming in a convenient 3-pack, this Frankford Arsenal X-10 Primer Tube Kit allows for 300 additional primers to be loaded up ahead of a reloading session and ultimately improves overall round output. The X-10 Primer Tube Kits can work with any progressive press on the market. Features100 primer capacity per tube allows the ability to pre-load an extra 300 primers ahead of a loading sessionPrimer tube kits are available for both small and large primers