Trap stray darts with the Viper Defender II Dartboard Surround, which is made of high-density V-foam with a velvet surface that minimizes signs of wear. The 4-piece, compression-fit design enables a fast, simple setup. Fits most standard 18" bristle dartboards (sold separately). Viper Defender II Dartboard Surround Black - Billiards And Table Tennis at Academy Sports