These will fit in all .43 Cal markers. Smooth finish for hassle free feeding. These balls hit hard! Solid aluminum weighing in at 1.9 grams each. These rounds can be re-used if shooting at a soft surface like one of our portable ranges! Balls will deform if they hit a hard surface and we do not recommend re-using them if that happens as they can get stuck in your marker. Comes in a pack of 16 rounds weighs 1.9 grams each material: Aluminum perfect for your upgraded .43 cal marker Grab some today and let the AirFunning begin!