This extra value pack of 36 blades contains a selection of some of our most popular scrollsaw blades: SSB-NF1115 Pack of 12 Skip Tooth Plain End HSS 15 TPI Scroll Saw Blades SSB-NS0713 Pack of 12 Reverse Tooth Plain End HSS 13 TPI 0.70mm Scroll Saw Blades SSB-PG0840 Pack of 12 Spiral Twist Plain End HSS 40 TPI Scroll Saw Blades