The Long Scraper Stainless Steel Rib is available in four different edge styles: 

Smooth edge
Extra-Fine edge (24 teeth per inch)
Fine edge (18 teeth per inch)
Regular edge (12 teeth per inch)

The smooth edge of the Long Scraper works great for throwing, and the toothy edge is fantastic for scoring, scraping and planing the clay. This is a good tool for sculpting and hand-building.

Mudtools stainless steel pottery and sculpture ribs are all made of cutlery grade stainless steel with varying flexibility among the tool styles.