Brother SAEMB6 Premium Embroidery Thread, 6 spools, 100 percent polyester 6 spools of 100 percent polyester, high shine, durable, colorfast, premium quality Brother embroidery thread 40 weight, 600 yard spools, in 6 brilliant colors, with red, green, yellow, blue, white, black Exceptional coverage and texture Genuine Brother accessory, designed and tested for use with Brother embroidery machines Compatible with most brands of embroidery machines