We have been making kamiyama type instruments manufacturer for twenty years and we are working hard day and night to bring it to market for you now. We have very good kamiyama type instruments experience and we take care of everything while making this kamiyama instruments. We use Japanese material in kamiyama type instruments and we pay special attention to its hardness. MATERIAL DETAILS. J2 AISI 420 JAPANESE MATERIAL . When we make kamiyama type instruments, we take special care that when the doctor uses our instruments, his wrist does not hurt. For neurosurgeon doctors it is very good instruments and very comfortable and very smooth