What's the right color of the tip I should buy from here if my original color is blue?

A quick learner from NJ says:
I only see three colors here : red, green and yellow. I did not see the option for blue. Can I buy the green one or red one? Can you also explain what the weight (10 to 22lb for red) means? Does it mean the window panel's weight? Thank you.
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Tom from SWISCO responded:

Yes, the weight range shown for each color option is for the sash weight. That said, the S900-29 was never made with a blue tip color option. Can you confirm that this is what you have? What is the diameter of the outer tube?

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