This 4 ply fingering weight yarn from Robin's Promise is made with 75% superwash merino and 25% nylon.  Each 100g skein is approximately 463 yards.  It is suggested you use a US2 to 5 or 2.25 to 3.75mm.  While you can wash this yarn - we suggest you hand wash it on cold and lay flat to dry.  This yarn is hand dyed in small batches in Williamsburg, VA.  It is suggested you alternate skeins in your projects.