Tom from SWISCO responded:
August 4, 2017
For a "29 3" marking, we expect a 30" balance and 2930 stamp option. Keep that information in the back of your mind for when you go to make a purchase. As for the difference between S380 and S385, here's how you determine it: measure the shoe, which is the bottom attachment. If you measure it as shown below, and your shoe measures 1-3/32", as in the photo, you need the S385. If the shoe measures only 1", go with an S380. Take a look:
Comparison of the S380 and S385 balance shoes.
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