prewound bobbins thread M Type Prewound Bobbin Thread High Tenacity 70D/2 Normal Tenacity 75D/2, Style A and L,paper or p M Type Prewound Bobbin Thread75D/2 normal tenacity,Style A and L,paper or plastic sided or sideless.Colorful PreWound Bobbin Thread ranges are as follows: 1. Sideless with core a. 100% High Tenacity Polyester Filament 70D/2 and 75D/2 "L" Type b. 100% Polyester Filament 75D/2 " ...