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% 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. 4 blades per pack.