Product material: PA6 polyamide Working temperature: -40~125, 140 can be reached but kept only for a short time Certification: European Environmental Protection Certification SGS:SH6134468/CHEM Structure: Wavy shape both interiorly and exteriorly Color: Black. Other colors are customizable upon requirements. Property: Good flexibility, twist resistance and good bending performance, able to bear heavy loads; acid resistant, lubricant resistant and coolant resistant; luster on surface and abrasion resistant. Bulk.