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This refill is usable...
October 26, 2008
Verified Purchase
This refill is usable in UMN-207 Micro, UMN-152, UMN-105, or UMN-138. I tried it in an UMN-138 pen body from Jet Pens and it writes smoothly. A friend complimented on my writing while I was using it, and I pointed out it is not me but the ink quality that is responsible.
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