Introducing our patent pending, disposable high visibility, blue chalk capsules for professionals seeking speed and efficiency on the job. Klein Tools replaceable capsules (Cat. Nos. CHLK00R and CHLK00B) ensure quick and mess-free refills every time. With the self breaking seal, users can effortlessly slide the capsule on the reel to refill their empty chalk reel in seconds. The transparent chalk housing provides an easy view of remaining chalk. Upgrade your chalk line experience with our patent-pending design, designed for professionals who demand the best.