?Customer Support?: If any blade set you purchased does not fit your hair clipper, please contact us any time, we will reply within 24 hours, and we will arrange a free or refund. ?Heat Resistant?: This blade is heat resistant, cooler and more comfortable for smooth cutting. was a good experience. ?Premium Professional Blade?: Professional Detachable Hair Clipper Replacement Blades delivers the sharp performance that experts demand.But Blades are not adjustable to a zero-gap, intended for professional use only. ?FIT Model?:Replacement Blades #2111 Blade Compatible with Wahl Hair Trimmers 8841/8143 /8700- Fits Professional Barbers and Stylists. ?Why Replace The Blade?:Trimmer usage over time will cause the blade to gradually dull. We recommend replacing your blade every 2-3 months to keep it sharp and efficient.