What does a 30-3 Balance Stamp match?

Thanks for posting! Yes, a stamp of 30-3 usually corresponds to our 3030 option. As for the shoes, I assume you're referring to the difference between our S385-31 and S380-31. This is a common question. The color doesn't matter, but the size does. I recommend you carefully go over our pictures and measurements to determine which size is closer to your own shoe. When measuring your old shoe, make sure to account for wear.