The Night Quill was designed to help people with hand and finger injuries spray more comfortably. I’ve had people tell me it helped them get back into graffiti because it made painting possible again. The original version was made for larger caps like the Astro Fat and similar shapes. The Low Rider does the same thing for NY Fats, Legos, and other smaller caps. Even if you don’t have an injury, it’s nice not having those little caps digging into your fingers during a long session.