Taylor Premium Thermex Ultra Ruby Swirl Picks are the most popular guitar picks from the Taylor DarkTone Series, made with an exclusive thermo-bonding process that helps them produce a warmer, more articulate guitar tone. These picks are available in the classic 351 shape and are precision-cut in 1.0mm, 1.25mm and 1.5mm sizes. Made in the USA. • MFSKU 70710 • UPC 887766100256