These are very nicely made and very tough. They are all (except the middle one) made out of the highe carbon, high hardness steel offered by Cozun and have their full tang option. The center one is made of their lowest qualit carbon steel and is an example of the disposable traineres made and used in Thailand inKrabi Krabong schools.
I tested one of the less ornate ones on an old Oak Chair I have, cutting into it with two-handed full force over the head swings 10 times. The edge didn't even roll or have any marks on it.
Blades are solidly made and have a nice dark color to the steel. While they do not have a japanese polish, they are differentially hardened and you can see the "Hamon" along the edge.
Very well made, extremely well balanced and at an incredible price.
Highly recommended.