Double blades, what are they?

[AK Lawn]

Sorry for doing this but i really do not know what they are i would appreciate if someone would let me in on the secret. Are they two blades stackes or one blade with two edges, and what makes them so superior? Sorry for the lame question but i must pled ignorance, i am from alaska and it takes a long time for info. to get up there! Thanks
AK Lawn

[MuskTurfKing]

You could of done a search and found hours of reading on it, but you'll find all you need at www.elmlawnsite.com

RIP Eric.

Hank

[vipermanz]

info is instant here but to help ya now, dbl blades are two blades on one spindle (+ x) in an x form, they are much better because the is more air volume and twice the edges so everything gets chopped twice or more