Couching Foot in three different sizes - 1.5mm, 2mm and 3mm, high shank (industrial) just order by the size you need. Each comes with yarn threader.  As for yarns or thread for couching, you may order these here: http://www.vicsew.com/index.php?route=product/category&path=87_115   Set "Free Motion" mode by lowering the feed dog or setting the stitch length to "0".

Fits Babylock: BL500A, BLQP    Brother: PQ1300, PQ1500, PQ1500S   Elna 7100  Janome: 1600P, 1600P-DB, 1600P-DBX   Juki Sewing Machine Models: TL-2000Qi, TL-2010Q, TL98E, TL98Q, TL98QE  Pfaff: 1200 Grand Quilter    Viking/Husqvarna: Mega Quilter  Singer  industrial-grade model Studio S16 

Couching is a decorative threadwork technique in which yarns, threads or other fibres are laid across the quilt and fastened in place by the machine's quilting thread. The three sizes of couching feet in this kit enable you to couch a wide variety of yarns, ribbons, threads and other fibres to add a special touch to your quilts.

We recommend you to use special thread stand TH-400 which you can order here http://www.vicsew.com/index.php?route=product/product&path=87_116&product_id=3089