No, the Mizuno JPX 921 SEL irons are not considered blades. They are forged irons with a moderate cavity back. If you want Mizuno blades, then go with the Mizuno Pro 225 irons. , The Mizuno JPX 921 SEL are not blades. They are a combination set of forged cavity backs with the 4 and 5 irons in the forged head and 6-GW in the Tour head. The SEL is a set designed for left handed golfers and stand for "Special Edition Leftie". , The Mizuno JPX 921 SEL are not considered a muscle back commonly referred to as blades. The SEL is a perfect middle ground between game improvement and blade style irons. In the lower irons (PW-6) the SEL's come with the JPX 921 tour iron which provides more forgiveness than a blade but more playability and control than a game improvement iron. In the 4 and 5 irons however, they are the JPX 921 forged which provide even more forgiveness and length to help players who struggle with their long irons. Therefore, the SEL's are not considered blades.