Topre Realforce 23U/23UB (WC01B0) Black Numberpad/Tenkeypad 23-Key Layout (19 standard + 4 extended) 45gram sensitivity, 4mm travel Topre Electrostatic Capacitive Key Switches High durability PBT (polybutylene terephthalate) keycaps, Dimensions: 93  152  37 mm (3.6 x 6.0 x 1.5in), Weight: 0.3kg (10.5oz) USB interface, Cable Length: 0.8m (2.6 ft)