Replacement Rotors for the Beckman Coulter Ultracentrifuges

The Agency would like to buy two off the shelf ultracentrifuge swing out rotors. One SW28 titanium rotor with aluminium swinging buckets, 6 x 38.5 mL, 28,000 rpm, 141,000 x g max and one SW32 titanium top loading rotor with titanium buckets. 6 x 38.5 ml, 32,000 rpm, 175,000 x g max. Both to be used with Beckman Optima LE-80K and Beckman Optima L-90K ultracentrifuges and conform to European Directive (98/79/EC) or equivalent.