Check the listing for details. 60X Custom Strings 57" 61 AMO 16 Strand Black Dacron B50 Recurve Bowstrings Bow. Condition: New with tags. Listed at 14.98 USD. Up for bid is one new Black 60X Custom Strings 57" 61 AMO 16 Strand Dacron B50 bowstring. This would fit a recurve bow needing the AMO 61 standard. The actual string length is always 4 inches shorter then the AMO Standard. 16 strands is good for 55-70lb; 18 strands is good to over 70lbs. You can go larger in strands then required but it is not recommended to go lower. The string is built out of B50 material and served with #4 nylon. ATTENTION INTERNATIONAL BIDDERS Priority shipping is highly recommended. With first class there is no tracking and weve had first class packages take anywhere from 6 days to 12 weeks to arrive. With priority you get tracking and your package should arrive in a timely manner. inkfrog terapeak