0789 – Dura-Tough Beta Twisted Curb Chain December 18, 2013 720 × 157 Dura-Tough Beta Twisted Curb Chain Dura-Tough beta curb is constructed of soft 3/4″ coated nylon. This curb is durable and water repellent. Features twisted curb chain. Available in hunter, black and brown only. Quality crafted in the USA.