This Gütermann universal sewing thread rPET, which is made from recycled bottles, can be used for all your This Gütermann universal sewing thread rPET, which is made from recycled bottles, can be used for all your sewing projects. The package contains 10 rolls x 100m of 100% recycled polyester. Pang colors. Reusing bottles for the production of sewing thread protects the environment - this without compromising on Gütermann's good quality. The sewing thread thickness no. Is 100. Recommendations: - Needles: universal, size 80 to 90 - Wash: Gentle wash (up to 60 degrees) - Dryer: Only at low heat Ironing: Iron at low heat