Hi Sticky---my wife says ceramic balls would be too hard for her to handle!!!!! Sorry---back to topic.----now I run 2st 4st and petrol motors.What are the best for these different types of motor. Are there some especially designed for a particular type and some definately not recommended? I know this is probably a broad subject but if you put me in the ball-park it would be helpful---and I suppose the prices are a lot different,but hopefully would be reflected in the reliability and longer service.yes? Thanks Dougal