1、Wide Compatibility: Our print head replacement is designed for 950 951 8100 8600 8610 8620 8650 251DW. Thus, please confirm your printer model before purchasing.2、100% Function Test: The printer printheads that are produced are functionally tested. Only printer printheads that pass the 100% function test are shipped.3、Longer Service Life: Our printhead has undergone strict material selection, accurate processing and strict factory inspection. Advanced technology ensures longer service life.4、High Performance: With consistent performance and high reliability, our printheads are suitable for replacing your broken, old, and non working printheads.5、Rust Proof and Colorfast: With light weight, rust proof, colorfast and durable, our printer printheads play a important role in office supplies and home printing.