Caliburn Professional Dartboard Surround – Hard Wearing – Red. This surround is constructed from a high quality flexible polymer and is engineered to be extremely durable and specifically designed to conceal penetration marks from stray darts. The surround fits tightly around the dartboard, removing any need for any additional fixings. Dartboards sold separately.Caliburn Professional Dartboard Surround – Hard Wearing – Black. This surround is constructed from a high quality flexible polymer and is engineered to be extremely durable and specifically designed to conceal penetration marks from stray darts. The surround fits tightly around the dartboard, removing any need for any additional fixings. Dartboards sold separately.