Remington Centerfire Primers have been specially designed with high-quality materials and manufactured to extremely tight tolerances. These primers are made with a priming mix that guarantees consistent ignition when used with a variety of different types of powder.Not only can Remington Centerfire Primers be used with a variety of powders but they have been rigorously tested at temperatures between -20 and +150 degrees F to ensure maximum reliability and performance. These primers come in a 1000-piece box to ensure that you always have them on hand exactly when you need them most.