Manufacturing of polyurethane balls with a SG of 3.2

Hi there I'm looking for someone who can manufacture polyurethane balls with a specific gravity of 3.2 in different sizes ranging from 3.5 mm to 25 mm. It must be a heavy duty polymer that is wear resistant. We are also looking for a polymer product with a specific gravity of 3.5 in a square shape in different sizes. We will be ordering 50 kilos at a time to start. We will need a sample for our engineers to test. Your bid is for a one (1) kilo sample of either product for our testing. After testing we will discuss the prices for the large batches. Good Luck