6 Medium Black bluRAFIA Schmidt 888 Ceramic Rollerball Refills Refill has 0.7mm ceramic ball for smooth writing, size (M) Medium Point. Measures 4 3/8" in length, please see the exact measurements and compare to yours. Offer in 2 colors (black and blue), check our other listings for different quantity and color combination. Fits 98% of rollerball pens which accept European standard size refills. Made in Germany.Try ours, odds are that your branded refill and ours were made by the same manufacturer.