Various types of tubes and vials can be accommodated, with a maximum weight of 1Kg per pair of rollers. The heavy duty PVC rollers are mounted on eccentric drive spindles to provide a rolling motion, ensuring a thorough mixing action. Speed of the rollers is fixed. To cover a wide range of mixing requirements. The sprocket and gear drive, coupled with ball race roller mounting, will ensure smooth trouble free operation. The unit can run continuously for many hours unattended.