Details: This is Fine Silver round wire 28 gauge, 0.013" , smallest; Small enough to go through all gemstone beads; Dead soft temper for easy wire twisting, looping, and even knitting . For the crafts, jewelers, and students. Each spool is 80 continuous feet (80'). This fine silver is jewelry-quality, not medical-grade. Do not use our silver material for colloidal purposes.