The professional PU surround has a thickness of approx. 3.5 cm. The PU material protects the wall v or damage and minimizes the number of falling darts, thereby also the Dart s and the floor are protected. The new improved fit with an inner diameter of approx. 45 cm, fits perfectly on every known Bristle Dartboard.-> One size fits all. The catch ring l ß can be easily mounted on the dartboard. The width of the protective ring is about 12 cm, this provides enough protection for the wall, even for inexperienced dart players. The total diameter d es BULL'S Pro Dart Board Surrounds is 68 cm. Available in the colors black, red and blue .