Description Unless specified, B50 bowstrings will be built 4″ shorter than AMO bow length. B55 bowstrings will be built 3.5″ shorter than AMO bow length. D97 low creep bowstrings will be built 3″ shorter than AMO bow length. Recurve end-loops will be slightly larger and longbow end-loops will be slightly smaller. B50/B55 endless loop bowstrings will be black with brown Brownell #4 end serving. D97 endless loop bowstrings will be black with teal BCY No. 3D end serving. Your choice of center serving.