3PCS Thread Tension Regulator for Industrial 9000 Computerized Flat Bed Sewing Machine Features: Made of material, durable e. complete tension assembly for industrial 9000 computerized flat bed sewing machines. These practical parts have smooth surface, no scratches, greatly increase your efficiency. Creating many professional sewing craft and saves much time. One set includes 3 pieces of sewing machine accessories, very functional for all your sewing needs. Specification: Material: Metal & Plastic Weight: 80g/2.8oz Quantity: 3pcs Each Product Length: 3.5cm/1.4inch; 4cm/1.6inch; 6cm/2.4inch (as pictures shown) Package List: 3 x Thread Tension Assembly Note: 1. Please allow slight error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.