heavy roller

listen to the pronunciation of heavy roller
الإنجليزية - الإنجليزية
The heavier of the rollers used for flattening the pitch between innings

Thommo pointed out on the radio that under normal circumstances the wicket retains moisture beneath a hard surface, and this water is brought to the surface by the heavy roller and causes problems on the first day of a game.

heavy rollers
plural form of heavy roller