The Magnum Shader Needle Cartridges by Turbo feature a standard #12 needle gauge/diameter, ideal for shading. Engineered for universal compatibility, they seamlessly integrate with all machines and grips, offering flexibility across a range of tattooing styles and techniques. Unlike typical cartridges, Turbo's Magnum Shaders utilize a spring system for needle retraction, providing an added layer of flexibility. However, it's important to note these cartridges lack a membrane, presenting a slight risk of ink blowback, particularly for tattoo pen users. The absence of a membrane emphasizes the need for careful handling, especially to prevent ink blowback and potential damage to tattoo machines. The cartridges' spring system enhances the needle's responsiveness, offering artists a level of control that complements their skill and technique.