500 Main blades question

[D.O.G.]

Most of the time I purchase my 500 blade from the same place. If I'm tight on money, "Who isn't lol" I shop around to save a buck by buying "B" surface blades. I can't never find that blemish but the couple of $$$$ I save...I can find . I found some Align 425 D and F blades for cheap. Maybe TOO cheap. Can anyone tell me if D or F is worth taking a chance purchasing? I've seen B surface and used them before. Now I've seen D/F/G surface. What happen to C & E? Is there some sort of chart to describe these surfaces or just poke and hope deal from the dealers?

 

[Fastfreddie]

I’ve been using these blades on my 450 and they are decent quality for the price.

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[Admiral]

I can only find a definition for Surface B which is a minor surface blemish not effecting the integrity of the blade, no mention of D/F/G. Maybe ask the supplier what they are, sounds worse than a minor blemish ?

 

[D.O.G.]

I can only find a definition for Surface B which is a minor surface blemish not effecting the integrity of the blade, no mention of D/F/G. Maybe ask the supplier what they are, sounds worse than a minor blemish ?

Yeah, I kind of thought of that too. These are the blades I get for my 500, 425mm but not for $17.99 like GrandRC Home