Mantis power synthetic 15l tennis string 200m reel squash badminton rackets an excellent value all round monofilament natural gut string that provides superb playability and comfort colours black red blue white a highly elastic monofilament is compressed to provide a durable central core and then surrounded by a series of elastic monofilaments before being coated with anelastic resin for durability and extra power excellent value available in 1 35mm15l gauge only