Note: 1. Please allow 0‑1 inch error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same， item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard. Features: 1、Specially designed to fit for Stihl MS251 MS261 MS271 MS291 MS311 MS381 MS391. 2、Practical garden equipment parts， can effectively improve the efficiency of chain saws. 3、Using high‑quality ABS material， it has good durability and corrosion resistance. 4、Chain saw air filter replacement parts，can directly replace the old or damaged parts. 5、It is easy to install and disassemble， and can be highly matched with the original equipment. Specification:Item Type: Air FilterMaterial: ABSWeight: Approx. 126g / 4.4ozFitment: Fit for Stihl MS251 MS261 MS271 MS291 MS311 MS381 MS391 ChainsawSize: Approx. 7.9x7.9x4.2cm / 3.1x3.1x1.7in Package List:3 x Air Filter