Amp Camp Amp - ACA

Knowing nothing about heatsinks, I wondered if I could trouble someone to let me know if this spec is ok for the ACA. Length I ordered is 10" (Qty2). This width was like $.30 per inch cheaper than some others close to this size, and now I'm afraid I might have gotten it wrong.
I still don't understand the c/w rating.

Extruded Aluminum Heatsink
Alloy: 6063-T5
Width: 4.850"
Fin Height: .66"
Base: .140"
C/W/3": approximately 2.25
Weight per Inch: .13
 
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