I am trying to come up with a wafer consisting of 4 different materials, each with differing densities (D1, D2, etc).
Each ring also has a specific weight restriction (w1, w2, etc.) as seen below:

D1=7.01 g/cc - w1=13 gr
D2=2.20 g/cc - w2= 4 gr
D3=7.87 g/cc - w3= 10 gr
D4=8.96 g/cc - w4=7 gr

The thickness of the wafer is to be 0.635 cm.

The rings need to be press-fit together.
I assumed the OD of the inner ring as the ID for the next material.

I need to check my calculations to see if I am correct prior to ordering materials.

Please help...