All Blacks forwards Andrew Hore and Kieran Read know the men wearing the small numbers on their backs will get the biggest workout against Argentina on Saturday.
All international teams are physical, it's part of the game at the highest level, but the Pumas have long been known for their strong scrummaging and intimidating forward play.
The All Blacks assembled in Wellington this weekend to begin their build-up for Saturday night's test at Westpac Stadium and Hore said the confrontations across the park would be hard-hitting.
"They're pretty tough up front traditionally," the Taranaki hooker said. "I've been lucky enough to play them three times and they definitely give you a hard go at scrum time and they play to their strengths as much as I know.
"It's just the way they've been brought up to play rugby. That's how they do it, much like the French people, they take pride in being good and strong and getting dominance up front like most teams try and do. That's one of their strengths and they're big men."