The Official Apple Sport Band with Space Gray Stainless Steel Pin. 38mm Black version. Model: (MJ4F2ZM/A)

Apple Watch Sport Band (includes straps that can be configured for either S/M or M/L length)

Features:
- Made from a custom high-performance fluoroelastomer, the Sport Band is durable and strong, yet surprisingly soft.
- The smooth, dense material drapes elegantly across your wrist and feels comfortable next to your skin.
- An innovative pin-and-tuck closure ensures a clean fit.