Spring Color selection on sash weight

A quick learner says:
I have a 3/8x 29" spiral tilt window but can not make out the color. The sash weight just under 18lbs. Which color co I need to order?
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Casey from SWISCO responded:

Hello,

I would recommend starting by comparing the specifications of the S900-29 tilt window spiral balance to your assembly. The red tip option will support a window sash weighing 10-22 pounds. For future reference, there is a chart on all spiral balance store pages under the product description that shows the weight capacity of each color option. Take a look and thanks for posting! 

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