stamp option for S380-29

A quick learner from port saint lucie fl says:
I would like to order a pair of Series 380 channel balance's. They are 29" long but there is no stamp for the stamp option for window weight.The window weigh's 28 lbs. as it is impact resistant. Can you suggest a stamp option?
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Tom from SWISCO responded:
Sure! Did you see the chart we have posted on the S380-29 page? If you cross-reference your sash weight to that chart, you can see that our 2840 and 2850 both cover 28 pounds. Just double check your weight to see if it's a little over or a little under and choose accordingly!
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