These threads are sold on 10m spools.
Kreinik Japan Threads are synthetic, non-tarnishing gimps available that give the appearance of stitching with real metals, ecclesiastical, and other surface embroidery.
Stitch with Japan #5 or couch it (tack it on the surface) using a thinner thread. You can use these threads to couch Kreinik 3/8" Trim when you want the couching thread to be invisible. The colors are perfect matches