The shaving heads can be replaced within minutes. After installing them, apply a small drop of oil to each head and run the shaver for 10 seconds to ensure smooth and proper operation. Compatible with Skull Pitbull, Butterfly Kiss Pro, and Palm shavers. Confirm compatibility before purchase. Rounded blade housing prevents nicks and cuts; ergonomic design glides smoothly across contours for irritation-free shaving. Keep your razor performing super well. It is recommended to replace the shaving heads every twelve months Shaver 4-Head Replacement Blade,Compatible with Skull Pitbull, Butterfly Kiss Pro & Palm Shavers, Bald Head & Body Electric Razor for Men & Women