Original SolarActive Color Changing Embroidery Thread Color to Color Sample Pack Color to Color Variety Pack: 3 Colors (Peach to Wine, Sky Blue to Deep Blue & Pink to Magenta) The unique color changing effect was tested and proven to last more than 2000 times in and out of the sun These threads will work on any embroidery machine up to 1200 rpm with any bobbin thread (poly, cotton, etc.). Changes color instantly in the sun! Changes back when you go inside. Made in the USA! Ships with tracking number!