Shear Magic Trimmer Blade is the replacement for the Shear Magic Rocket Trimmer (blade only). The trimmer is not included but is available separately. Reasons you may need a replacement blade include: Blade wear: Over time, the blade on a trimmer can become dull or damaged due to regular use. A replacement blade would be needed to ensure effective and efficient trimming. Maintenance: Regular maintenance of grooming tools is crucial to keep them in good working condition. Replacing the blade is part of routine maintenance to ensure optimal performance. Accidental damage: Accidents can happen, and a blade may get bent, chipped, or broken. A replacement blade is necessary to restore the trimmer's functionality in such cases. Multiple users: Several individuals may use the trimmer in professional grooming settings or households with multiple pets. Having spare blades ensures that each person has a fresh blade for hygienic purposes or to accommodate different grooming preferences.