Springfield XD-S 9mm 8 Round Mid-Size Magazine w/ X-Tension Sleeves. With an eight round capacity, these mid-size magazines fit Springfield XD-S model pistols chambered in 9mm. The magazines are made from nickel plated steel and include two interchangeable polymer X-Tension sleeves in #1 (Narrow) and #2 (Wide) sizes. Springfield X-Tension magazine sleeves fit over the magazine for customization of the grip diameter and length, allowing for a more personalized fit and improved shooting comfort.