Accu-Fine pen needles are sterile, disposable needles designed for use with insulin pen injectors. These 6mm length needles feature a 31G ultra-fine gauge for comfortable subcutaneous insulin delivery. Each box contains 100 individually sterile needles. The needles are compatible with Accu-Chek insulin delivery devices and feature a 0.25mm (31G) diameter. They are specifically designed for single use and come individually packaged to maintain sterility. The 6mm needle length is suitable for subcutaneous insulin injection.