I picked up some 20g sliders for my s250 People. I had heard various reports of what the original weights were (24 or 20g). So when I pulled out the old weights, I decided to weigh them.
No scale, so I took the 6 original rollers and 6 20g sliders to the supermarket and checked them out as bananas. Both sets weighed .27 lb, or about 20g per roller/slider.