So Fine! #50 is a #50/3 lint-free and extra smooth all purpose polyester thread. Each spool has 550 yards. Excellent for Sewing, Serger, Bobbin Thread, and Quilting.

Tex 30. Poly-wrapped poly core thread. 6,000 yds.

#50/3-ply Cotton thread - 600 yd. spool. MasterPiece is nature's finest thread, made from extra-long staple Egyptian-grown cotton and has been designed for piecing, applique, and detail quilting. Get perfect seams with MasterPiece cotton thread.

So Fine! #50 is a #50/3 lint-free and extra smooth all purpose polyester thread. Each spool has 550 yards. Excellent for Sewing, Serger, Bobbin Thread, and Quilting.