Slip Dacron Connectors are offered in four sizes that cater to most elastic sizes, ranging from our thinnest solid elastics to our 19 Hollo. The beads are soft and contain an inner recess to securely hold the elastic knot. To attach, tie the elastic around the dacron loop and slide the bead over the knot for added protection. The Dacron cord is color-coded: Micro (Blue), Small (Red), Medium (Green), Large (Yellow).