4X3 3X4 12 Keys/Buttons Matrix Numeric Keypad Electronic Membrane Keyboard - China Pet Membrane Switch, PC Membrane Switch | Made-in-China.com
ELSRA Full Size Classic USB Wired Membrane Keyboard with Numeric Keypad, 24 Anti-ghosting Keys, Large L-Shaped Enter Key, Gray/Light Gray : Amazon.co.uk: Computers & Accessories