28C USB

Quick Learner
Dec 15, 2021 1:44 pm
Hi, I was hoping you guys might be able to assist me. I recently purchased some channels believing they were the ones I needed. My order number was #1779801 but upon first look, I want to say I purchased an incorrect one. I was hoping that with these pictures included you might be able to tell me the correct channel that I need. The stamp included on my old channel in the pictures also says "28C USB" on it since I didn't include that in there. Also, depending on if this is one that you carry, I was hoping that I can be assisted in either an exchange or refund
5 user uploaded images
2 Replies

Emily from SWISCO
Dec 17, 2021 9:07 am


Hi there!
With this combination of attachments, you could have either an S380-29 or S385-29 channel balance. You’ll need to measure as shown below. The Series 380 has a 1" bottom attachment, and the Series 385 has a 1-3/32" attachment. Your 28C stamp usually corresponds to our 2830 option but you can always weigh your sash on a scale to be certain. There's a chart on the S380-29 and S385-29's store pages that will show you which option you'll need based on the weight of your sash.
You can also see our return policy here.
Let me know if you have any questions!

Comparison of the S378, S380 and S385 balance shoes.
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