Dear sir,
thank you very much for your best quotation!!!!    
we are ordering 5000 pcs per month, and the 50k pcs will be the consumption in the whole year. Our target price is 0.60 usd for each order of 5000 pcs
But before starting, we need to receive samples for homologation, we do life cycle test and see if there is any wear out of the bearing.

The first thing is that we need you check the attached drawing and you confirm you will send the samples according to this drawing. For this matter, we need you sign this document.