Tartarus V2 thumb adapter. Provides better control when using the side pad for movement. : r/razer
Why I got a Blade, plus the number pad you wouldn't actually use : r/razer
Razer Tartarus V2 - Mecha-Membrane Gaming Keypad (32 Fully Programmable Keys, Ergonomic Form with Detachable Palm Rest, Hypershift Functionality, RGB Chroma) Black : Amazon.co.uk: PC & Video Games