Microsoft Surface Pro X Signature Keyboard with Slim Pen Bundle Next-level versatility comes in the perfect pair. Surface Slim Pen stores securely and recharges in the premium Surface Pro X Signature Keyboard with, featuring a large glass trackpad and luxurious, Alcantara® material covering. Surface Pro X Signature Keyboard is compatible with Surface Pro X only. Store, charge, type, and write: Transform Surface Pro X1 into a full laptop and portable studio with Surface Pro X Signature Keyboard. And with Surface Slim Pen stored, charged, and close at hand, it delivers typing and writing in one.