The product is a lot of 4 Suttle 900LC4-03Q Phone Line Conditioners DSL Filters, with 3 new filters and 1 used filter included. These DSL filters are designed for universal compatibility, featuring a DSL/Phone (RJ-11) Male connector and a flat cable design for easy installation. Made in China, these filters are specifically compatible with the Suttle 900LC4-03Q model, providing reliable performance for maintaining a stable internet connection. Ideal for networking and computer setup, these filters help to improve the quality of your phone and internet signals.