I received the o-rings for Opus 88 Koloro Demonstrator fountain pens and they work great. Inexpensive, quick to exchange, paired with fast shipping, this combination is unbeatable. I don't need another batch because you get 10 and it's very unlikely I'll lose the o-ring again, but if you have a pair of OPUS 88 fountain pens then this is a must have. Thanks for reading, good luck!
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