The invention relates to a sleeve (1) comprising turns (2) and end caps for fixing it between a fixed part and a moving part, allowing the passage and the protection of a bundle of cables, the turns (2 ) having flat sides forming crowns (2b, 2d), characterized in that the rings (2b, 2d) of the turns (2) are pelletized, so that the turns (2) joined do not adhere to each other.
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