2 PCS Spare Nibs ( 1 x extra fine & 1 x Medium ) For Brass Fountain Pen You will receive 2 pare nibs with black section feed parts for this item . One for 0.38mm EF , one for 0.6mm Medium . It is very easy to replace the nib , just screw out the nib from your pen and replace the new nib by screwing it back . It compatible with all the brass fountain pen offered by Lanxivi . To check if it works with other fountain pen , please send us a message to confirm .