While some groomers use a 5-in-1 type of clipper set where the length of the cut is adjustable without changing a blade, most professional groomers prefer to use different blades. Each individual blade has a specific purpose depending on the dog breed and what style the customer has asked for. A #4 blade is generally the blade with the longest cut without using a guard or comb, leaving 3/8” of hair behind when cutting against the grain of the fur. This blade is great for all-over body work on some smaller terriers as well as Lhasa Apsos and Shih-Tzus. It is also a very popular length for pet poodles who are not being groomed for show, leaving the hair short but still quite fluffy. At PetEdge, we carry the most trusted brands in #4 blades such as Andis, Oster, Wahl and more. Check out the great options for single and bulk purchasing of #4 blades below from PetEdge.com.