600 21 inch tilt spiral balance

A quick learner from Reading, PA says:
I placed an order for 6 red 21 inch tilt spiral balance.
I see there are 3 kinds, red, black, and blue. What is the difference?
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Tom from SWISCO responded:
Each tip color denotes a different spring strength. We actually have a chart on the S600-21 store page that shows how much weight two balances of each color can support.
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