Finger Sleeve/Band worn by NBA players?

Nike used to sell them in mid early 2000's. Whats the point of a finger sleeve?
 
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i bought some cheap ones off amazon a few months back, because i tore my finger up on the rim over and over again. stopped for a week and let my finger heal up...tried it again and tore it up even worse the next time i tried dunking. had blood dripping all over the court. dunno what the hell nba players use them for, but i bought them to protect my finger next time i try dunking.
 
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