A great source of information about needles and threads can be found st Superior threads and the owner Bob Purcell. Top stitch or quilting needles are the best to use for FMQ Ballpoint needles are for knit fabric and are intended to push the yarns in knit fabrics aside rather than penetrating them which happens with woven fabrics regardless of fiber content. It is also important to use the size needle recommended for the size thread you are using.