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Edge I ordered a large series of sample base rings to help me figure out my ring size and I feel it was absolutely and completely worth it, given the investment I will he making for my custom Orion. I found even .5mm made a difference and while it took a little bit I am now confident that I have the absolutely right size for my device.
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C Feel a lot more comfortable I'm getting the right size
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Alex Horkman Very helpful in verifying fit
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John These really help in deciding what size you should get, especially if you're between sizes.
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Mark Merchant These are definitely worth purchasing before ordering a full device! Same yourself having to spend even more in the long run and just get a couple to make sure.