Stylus Shape: Conical Stylus Dimension: 0.6 mil To remove the old stylus (needle), hold the cartridge in one hand, grasp the plastic stylus housing with your thumb and forefinger, and pull it away from the cartridge. The stylus assembly will come off at a slight angle, as shown by the arrow. To install the replacement stylus, insert the new stylus assembly into the cartridge at a slight angle, so the hook at the end of the stylus fits into the slot in the cartridge body. The stylus assembly should click into place when fully seated on the cartridge. The stylus must be fully seated on the body for proper operation. Audio-Technica has been perfecting the art of transducer technology since our first hand-crafted phono cartridge in 1962.   More info, https://www.audio-technica.com/en-us/atn3600l