So Fine! 3-ply Machine Quilting Thread, 50 wt (3280 yd) - #435 It's a Boy by Superior Threads
50 wt. 3-ply polyester thread. Designed for bobbin thread, quilting, and sewing. So Fine! is a lint-free, matte-finish, smooth 50 wt. 3 filament polyester thread. Due to its fine nature, So Fine! is an excellent blending thread and loved by both longarm and home machine quilters. So Fine! also makes a wonderful bobbin thread.