Features: * new and high quality * Made of high-quality materials, sturdy and practical * Built and tested to strict quality control standards. * Stable performance and high reliability. * LC/UPC single mode/multimode fiber optic circulator OM1 OM2 OM3 OM4 LC loopback for Jumper fiber optic circulator coupler. * Fiber optic loopback cables provide a return signal to fiber optic equipment and can be used for testing purposes and to isolate any network issues. Specification: Part name: Optical fiber looper Model(optional): SM 9/125, OM1 62.5/125, OM2 50/125, OM3 50/125, OM4 50/125 Material: PE Size: as shown in the picture Color: as shown in the picture application 1. Device interconnection 2.Network loopback 3.Component testing Package Contents: 1 x fiber optic looper Note: 1.The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 2.Please allow slight manual measurement deviation for the data.