Vita Vibe VS42-B-C12, Tennis Singles Sticks Club Set (12 Pairs, Satin Black) Used to provide proper USTA regulation 42" tennis net height for singles play on a doubles court Satin Black powder coated aluminum for all-weather use - corrosion resistant, lightweight, & durable "V" notched at the top to allow for a secure fit to the tennis net Accurate 36" line mark on singles stick is used to measure proper placement and net height Made in USA - 10 Year Warranty