Compression segment Ø 40 x 1.2 mm. Models: MS 211 with serial number up to: 295856561 Other Models: Chainsaws: 021, 023, MS210, MS211, MS230 Brushcutters: FR230, FR230T, FR350, FR450, FR480, FS230, FS250, FS350, FS380 Note: The code refers to 1 piece.