Mast P20 Permanent Beauty Wireless Pen Machine With 2.5MM StrokeMast P20 PMU Wireless Tattoo Rotary Pen. The Mast P20 is a straightforward machine that is suitable for all levels within your PMU career. This machine gives you full control over your PMU procedures. With its 2. 5mm stroke, the mast P20 is versatile and ready to take on all kind of skin type and is also designed to cause less trauma to your clients skin. For easy operation, this machine has an OLED display screen interface which makes it easy to