Cork Asalato 47mm (2 in 1set)

I'd imagine these are much lighter than standard asaltos. Is that a problem?

I'm confused by the size options. Is that the diameter of the ball? If so, I have small hands then the smallest size is best?

does 2 in 1 set mean 2 balls on 1 cord is what i'm buying so i would need to buy 2? or does it mean 2 full pieces in one set as in 1 for each hand?

Are these cork asalato silent? It is not clear from the description whether these are playable or only for silent practice.