An assembly for guiding and protecting optical fibre cables or optical wave guides, the assembly comprising: a first number of first guide tubes (72,74) and a second number of second guide tubes (76,78), the two first guide tubes (72,74) are in coplanar and parallel relationship, the two second guide tubes (76,78) are in coplanar and parallel relationship, said first and second number is equal to or greater than two, each of said first and second guide tubes (72,74,76,78) being adapted for receiving an optical fibre cable along its complete length; said assembly further comprising: an elongated first tubular shell, and an elongated second tubular shell, said first number of first guide tubes (72,74) being supported within and in parallel relationship with said first tubular shell, and said second number of second guide tubes (76,78) being supported within and in parallel relationship with said second tubular shell; said assembly further comprising: a first connecting strip interconnecting said first and second tubular shells (106, 108), defining a separation between said first and second tubular shells (106,108), and positioning said first number of first guide tubes (72,74) and said second number of second guide tubes (76,78) in parallel, said first and second tubular shells (106,108) and said first connecting strip originating from a single extrusion process establishing an interference fitting between said first and second guide tubes (72,74,76,78) and said first and second tubular shells (106,108), respectively; said assembly further comprising: a third number of elongated auxiliary strength elements (116, 118) in coplanar and parallel relationship with said first and second guide tubes (72,74,76,78) and embedded in said first connecting strip, and the longitudinal thermal expansion of said third number of auxiliary strength elements (116, 118) being smaller than the longitudinal thermal expansion of said first and second guide tubes (72,74,76,78). a first number of first guide tubes (72,74) and a second number of second guide tubes (76,78), the two first guide tubes (72,74) are in coplanar and parallel relationship, the two second guide tubes (76,78) are in coplanar and parallel relationship, said first and second number is equal to or greater than two, each of said first and second guide tubes (72,74,76,78) being adapted for receiving an optical fibre cable along its complete length; said assembly further comprising: an elongated first tubular shell, and an elongated second tubular shell, said first number of first guide tubes (72,74) being supported within and in parallel relationship with said first tubular shell, and said second number of second guide tubes (76,78) being supported within and in parallel relationship with said second tubular shell; said assembly further comprising: a first connecting strip interconnecting said first and second tubular shells (106, 108), defining a separation between said first and second tubular shells (106,108), and positioning said first number of first guide tubes (72,74) and said second number of second guide tubes (76,78) in parallel, said first and second tubular shells (106,108) and said first connecting strip originating from a single extrusion process establishing an interference fitting between said first and second guide tubes (72,74,76,78) and said first and second tubular shells (106,108), respectively; said assembly further comprising: a third number of elongated auxiliary strength elements (116, 118) in coplanar and parallel relationship with said first and second guide tubes (72,74,76,78) and embedded in said first connecting strip, and the longitudinal thermal expansion of said third number of auxiliary strength elements (116, 118) being smaller than the longitudinal thermal expansion of said first and second guide tubes (72,74,76,78). an elongated first tubular shell, and an elongated second tubular shell, said first number of first guide tubes (72,74) being supported within and in parallel relationship with said first tubular shell, and said second number of second guide tubes (76,78) being supported within and in parallel relationship with said second tubular shell; said assembly further comprising: a first connecting strip interconnecting said first and second tubular shells (106, 108), defining a separation between said first and second tubular shells (106,108), and positioning said first number of first guide tubes (72,74) and said second number of second guide tubes (76,78) in parallel, said first and second tubular shells (106,108) and said first connecting strip originating from a single extrusion process establishing an interference fitting between said first and second guide tubes (72,74,76,78) and said first and second tubular shells (106,108), respectively; said assembly further comprising: a third number of elongated auxiliary strength elements (116, 118) in coplanar and parallel relationship with said first and second guide tubes (72,74,76,78) and embedded in said first connecting strip, and the longitudinal thermal expansion of said third number of auxiliary strength elements (116, 118) being smaller than the longitudinal thermal expansion of said first and second guide tubes (72,74,76,78).