The fineliner refills by Montblanc, Faber-Castell (e.g. Graf-von-Faber-Castell roller) and many other manufacturers are made by Schmidt Technology and are largely identical in construction. Apart from the refill end and the thread, they correspond to the Euro standard for rollerball refills and can therefore be used in most housings that use this standard. The selection of brands and models with Schmidt fineliner refills is thereby very large. On the topic of choosing writing instruments for left-handers, personal trying-out in the shop is decisive, since the writing behaviour strongly depends on individual pen posture.