Nike Mercurial Ultracell Blue 1998 SG – Classic Soccer Cleats
I believe these are the mercurial r9 from 1998. I remember having a pair with the same colorway but without cleats. For indoor soccer I believe but can't find any info online.
Nike Mercurial boots: Every version of the boot through the years | FourFourTwo
Nike Mercurial World Cup football boots from 1998 to 2010
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NEW NIKE RIO FG CLEATS BALCK/WHITE-BLUE SPARK MENS SIZE 8.5 (316628 014) | eBay
15 years with the Mercurial R9 - The original faces off with the heir
Nike Mercurial World Cup football boots from 1998 to 2010
Nike Mercurial boots: Every version of the boot through the years | FourFourTwo
Amazon.com: Blue Mercurial Soccer Shoes
15 years with the Mercurial R9 - The original faces off with the heir
Nike Mercurial FG 1998 R9
Nike Mercurial World Cup football boots from 1998 to 2010
Nike Mercurial World Cup football boots from 1998 to 2010
Rare Vintage NIKE Mercurial R9 1998 World Cup Ronaldo FG Boots Cleats Shoes | eBay