SkillToyz metal knuckle finger fidget rollers. Titanium, brass, stainless steel knucklebone finger roller skill toys. Choose from polished (silver) or matt finishes. The polished finish is slick, shiny and beautiful, but slightly more slippery and so a bit harder to grip and control. The matt finish is less slippery and easier to grip and control. Both are the same size, shape and weight. Both fit comfortably in the fingers for hours of relaxing fidgeting in a surprisingly satisfying way! There is no right choice - bling or practicality is how I would sum it up (Pete - Skilltoyz.com).