paint roller
Instrument fitted with a detachable handle for spreading the paint evenly on a large surface.
roller frame 
Metal pivoting structure inserted into the roller cover as support.
handle 
roller cover 
Detachable cylindrical part, covered with natural or synthetic fibers adapted to the nature of the product being applied.
tray 
Container used with a roller; it has a deep area to hold the paint and a ribbed area for coating the roller cover with the amount of paint required.