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JetPens®.com - Love at First Write®
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 5.0 (1 customer reviews)
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  This refill is usable..., October 26, 2008
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.