How to Tie a Knot in a Biothane Ball Tug Strap

How to Tie a Knot in a Biothane Ball Tug Strap Step 1: Tie a knot in a fresh biothane strap. Step 2: Pull tight and leave some tail at the end. Step 3: Loop tail over knot. Step 4: Push tail under and through knot. Step 5: Pull knot tight and begin break-in process. Replacement BioThane Ball Strap Leerburg Foam Ball with BioThane Strap Please keep in mind that once the knot is broken-in and secured, it is not coming undone. The biothane will become more soft and pliable with use. Because of this, the biothane begins to grip itself which means untying the knot becomes almost impossible. If properly used and taken care of, biothane ball straps can last a really long time.