The Vintage Scientific Anglers System 7 Fly Reel Spare Spool by Hardy is a high-quality spare spool designed specifically for the Hardy Marquis 7 fly reel. This spare spool allows anglers to easily switch out their fly reel spool, providing flexibility and convenience during fishing trips. With its durable construction and compatibility with the System 7 fly reel series, this spare spool is a must-have accessory for avid anglers looking to enhance their fishing experience.