AMERICAN & EFIRD-Mettler Metrosene 100% Polyester Thread. Whether on cotton; synthetics; mixed textiles; linen; or even silk; Mettler Metrosene makes for smooth seams. And because Mettler has given Metrosene the ideal gliding properties elaborate tension adjustments are finally a thing of the past. 1094 yard spool-economy put up. Imported.