This paint roller includes Nylon fabric and TPR handle, fit for EU style. That can be optional if you want US style.
The cap has two diameters, 38 mm and 48mm. 38 mm is enough for common projects. 48 mm is for high level.
The handle bottom can be inserted clip-type extension pole. That can make the paint roller to paint the high parts where the people can’t touch. The hole in the handle has two sizes, one is 6 mm, match to 5.7 mm rod. Another is 8 mm, match to 7.7 mm.