These narrow, pointed-tip seam ripper blades are ideal for opening the initial stitches in a seam, to slide between very narrow stitches, or to get into other tight spaces. They feature the slice finger-friendly edge, which cuts effectively but is safe to the touch (lowering injuries) and last up to 11 times longer than metal blades. Because we use 100 percent zirconium oxide, these blades are also non-conducting, non-sparking, non-magnetic, chemically inert, and will never rust. Designed for slice handles, these blades fit in our manual and auto-retractable seam rippers, our craft handles, scalpel, and precision knife. Enjoy precision and accuracy with the 10537 blades. Four blades per pack. Cutting edge is safer than traditional blades. Finger-friendly edge cuts effectively. Lasts up to 11.2x longer than metal blades. Fewer blade changes = fewer injuries. Reduces injuries, lowers costs. Non-sparking, non-conductive, non-magnetic. Oil and lubricant free. 100% recyclable.