This is a completely new design integrated with new ergonomics! It is compatible with small, medium and large size hands. Just put your finger on the thumb rest and feel the difference! The Eemann Tech Thumb Rest Slide Stop for CZ Shadow 2, Shadow 2 Compact /TS/TS2 is made from one piece of carbon steel and CNC machined to the highest standards. It is designed to be used with CZ Shadow 2, Shadow 2 Compact / CZ TS / CZ TS2  firearms and their models.