Frank, the easiest way would be to cast them in a two part slicone mold using the casting material of your choice.
At the low cost that you can buy this type of knob, they are CHEAP and there are a good variety of styles out there. I have no idea why you would want to make your own especially in such small quantities. I'd want to spend my time making the midibox and not having to bother with making knobs.


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rubber material: TPE,TPU,TPR from Buyer company,santopere.