ball bearings in a ball nut, how many?

[vargai]

linearmotionbearings2008 (Chai) is one of the most used Chinese suppliers for this forum I think. Quality seems consistent with the price but I have not used any other similar products for comparison.

Other used ebay sellers I've seen mentioned are; solar.jean , supermario-au
Strangely you sometimes have to log into ebay.com to see the listings.

Thanks.
Is Chai a contact person or place?