Gutermann 6206 Mid Grey Natural Cotton Sewing Thread - The Little Fabric Shop
Gray Sewing Threads - 10 Large Spools of Polyester Thread for Hand, Quilting & Sewing Machine - Grey Shades Plus Black & White - 1000 Yards Per Spool : Amazon.co.uk: Home & Kitchen
Silver Grey Nylon 6.6 Bonded Sewing Thread - Heico Direct
Recycled 'Sew all' Universal all Purpose Sewing Thread 7500m Cones - James Tailoring Sustainable Haberdashery