PH39, Full Flow Lube Spin On Filter, Performs At 96,2% Efficiency In The Single Pass Efficiency Tests, Uniquely Formulated For Top Rated Efficiency For The Life Of The Filter, Has A Thick, Multi-Fiber Media & Provides A Maze To Trap Contaminants Effectively, Has A Grip With A Rough Textured Surface That Stays In Your Hand No Matter How Oily Things Get.