About this item Model: Our Dog Grooming Blades Compatible with ONEISALL Dog Low Noise Dog Clipper & Dog Hair Vacuum clipper Professional Clipper Blade: The replacement blade is made of Ceramic Blade & Stainless Steel Blade,Provide excellent cutting performance, ceramic blade can be more temperature -resistant, keep pets quiet Easy To Install And Clean: replacement blades are easy to replace and clean, Just remove the old dull blade,side up the new one and snap it into place Products include:2 set of 30# blades,Cut Length 1/50″(0.5mm),Regular size More Size On the basis of the original 0.5MM size, we have added 4 longer hair sizes, 7F (3.2MM); 5F (6.3MM); 4F (9.5MM); 3F (13MM) Why Replace The Blade: Regular blade replacement is more efficient and comfortable, and gives you the best experience. We recommend replacing the blades every 2-3 months to keep them sharp and efficient