The product is a lot of 20 StarTech MCM1110MMLC Gigabit Ethernet Fiber Media Converters. These converters are used for connecting fiber optic cables to Ethernet networks and are made by the brand StarTech. The media converters are sourced from Taiwan, and each unit includes one transceiver/media converter. They also come with a California Prop 65 warning, indicating that they may contain materials that are harmful if ingested or come in contact with.