... Finger,stylusMaterial ITO Glass Thickness 0.7;1.1,1.8,2.0,3.0mmITO Film Thickness 0.188 mmEnvironmental Operation Temperature-20 ... operating force 15-70gsurface hardness 3hlife expectance>1,000,000Nib 0.8mm,playing key load 100g,hit the speed button 5 times ...