14.5 x 4.2 x 1.5mm NYLON CASSETTE IDLER
15.5 x 6.7 x 2.0mm NYLON CASSETTE IDLER
21.0 x 3.0 x 2.0mm BRASS CASSETTE IDLER
21.0 x 3.0 x 2.5mm BRASS CASSETTE IDLER