Hygienic Grooming These replacement foils are fully washable and are stainless steel which allows for easy clean up and accurate cutting results Bi-Directional Cutter Bar The bi-directional long hair cutter bar will help shave your long hairs even after 3 to 4 days of growth which will help provide unbeatable shaving results Good as New This shaver replacement head will help return your Wahl shaver back to its original 100% cutting performance, its like getting a new shaver again Recommended Use We recommend replacing the heads about once a year, in some cases every year and a half is acceptable, this is all dependent upon usage The Brand Used by Professionals - Wahl clippers and trimmers have been used by professionals in the salon & barber industry since 1919; Featuring self-sharpening precision blades & quality construction