This listing is for cemented carbide inserts, they are K10/YG6 fine grained cemented carbide for a keener edge and longer time between sharpenings.
They are supplied in two sizes off the shelf, though if you have any specific requirements regarding dimensions or nose radius please send a message to discuss them.
The 20x30x2mm inserts are good for general to finish scraping.
The 30x30x2mm with a 140mm nose radius are ideal for quickly hogging out material, or for working on larger pieces.
Scraper handles for these inserts can be purchased here You can use a 30x30mm insert with the standard scraper handles that I supply.