Blunt Needles For electrolyte injection and scalp impedance reduction. Model No. Description Price WBN 15mm (3/8") x 20 gauge. Shipped non-sterile. $1.00 Add to Cart E8B Blunt needles, 18mm (3/4") x 16 gauge (100/pkg) Pre-sterilized. One time use only. $100.00 Add to Cart