global focus marketing & distribution ltd centrifuge system silencer 2200 the silent solution model s2200, s/n 05264207, and s/n 05264208, voltage: 117 vac, 60hz, 8a max. 4000 rpm, comes with centrifuge holders 2 hold 26 vials (1/2"), and 2 hold 19 vials (5/8"), speed goes up to 3000 rpm.