My reliable Surface Pro 3 has been under a Stickerboy.net Black Ostrich Leather (vinyl) skin for well over a year. Remains like new, despite heavy use. The SP3 now sports a Type Cover 4, a Surface Pen 4 (blue), and a clip / holder. I ordered the same Black Ostrich skin for the keyboard. It is optional to place skin on the trackpad. I like it. Can always remove. The holder works with either the Surface Pro 3 pen or the Surface Pen 4. It has gentle but large surface area to grip the left or right corner, without compressing the screen. I am not using the adhesive pad to keep it in place. Not necessary for me, maybe because I have also had glass screen protector applied, also for over a year. The extra thickness is just right for the clip to grip without the adhesive.