Made of beefy 5/32" (#4-size) galvanized aircraft cable, with flexible, black PVC tubing. Zinc-plated copper oval sleeves are covered with two layers of PVC heat-shrink tubing, for durability and a smooth feel. 20.5" overall length Used in conjunction with a climbing hammer to assist in cleaning stubborn pitons, especially in expanding placements. Using a Funkness Device to clean heads is not recommended, as it can result in damage to the rock, and degradation of future placements.