Worn Out Resistance: Structured by the Titanium Alloy material, simulate the realities of ballpoint tips, makes write and draw naturally, cost saving, you don't need to replace the tips in high frequency. Recommended to use with the screen film protector to achieve the smooth user experiences High Sensitive: Keep the same accuracy with 4,096 pressure points, Pressure sensitive with the light weight control, no lag, sketch, and shade in real-time with the lightest touch Widely Used: Works with the Pen with a single side button compatible for Surface Pen Model 1776(for compatible with Microsoft Surfaceicrosoft Surface pro 7 pen2017 ) and for Surface Pro 4 Pen, NOT for Surface Pro 3/Surface 3 Laptops pen/Surface Pro 2 and other prior obsolete Surface products. Accuracy Control: Smooth slim ballpoint tips provide a realistic pen-like drawing feeling, and precisely control in fine detail when drawing or writing. Easy Installation: Replace the tips the same as the old pen tips, not including the pen