tension.And it's cap can prevent the water into the barrel.It is colored differently to distinguish the cable sizes.Marked with type,cable size,die size,inner cable length and number of crimping.

Cable Size(mm2)       Plastic Sleeve Diameter(mm)     Length(mm)

    A             B                                 C                                     L

    6             16                               16                                   73.5

    10           16                               16                                   73.5

    16           16                               16                                   73.5

    16           25                               16                                   73.5

    25           25                               16                                   73.5

    16           16                               20                                   98.5

    25           25                               20                                   98.5

    35           35                               20                                   98.5

    50           50                               20                                   98.5 

    70           70                               20                                   98.5

    95           95                               20                                   98.5

pre-insulated sleeve