numbers letters i.e. 105 or RF

I must sound like a complete idiot but can someone explain to me why the tracks and bottoms are called with numbers and letters
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Numbers are representing the track height, Bottom letters represents the characteristics of it.
You could have simply asked this in random thoughts, or even taken a look at the beywiki entry on MFB.
The number:
85-230 deonate the height of the track
145 for example would be in height 145mm

The lettering at the beggining of a track name is a describer for the track.
DF - Downforce, GB - Gravity Bowl .etc

The lettering at the end of the combination or blade, RF, SD.etc
describes the bottom.
RF - Rubber Flat, SD - Sharp Defense, so on and so forth.
In future, ask smaller questions like this here:
http://worldbeyblade.org/Thread-Ask-a-qu...read-Rules

Or even better, learn by looking around the website.

Closed.