A modular exoskeletal system for handling at least one hand finger of a user, said modular exoskeletal system comprising: - at least one finger exoskeleton comprising n ≥ 1 rotational joints and m ≥ 1 link arranged to rotate by means of respective rotational joints, said n ≥ 1 rotational joints comprising a fastening rotational joint arranged to allow the rotation of a fastening link about a rotation axis x, said or each finger exoskeleton arranged to transmit an actuation torque M from said fastening link to said hand finger; - an actuation unit comprising: - an actuator adapted to generate said actuation torque M; - at least one Bowden cable comprising an inner cable and an outer coating, said or each Bowden cable arranged to transmit said actuation torque M to said or each finger exoskeleton; - a locking device having at least one opening arranged to constrain said outer coating of said Bowden cable and to allow said inner cable to slide; - quick coupling means arranged for causing said modular exoskeletal system to reversibly pass between an actuated configuration, wherein said actuation unit is connected to said or each finger exoskeleton, and a not actuated configuration, wherein said actuation unit is disconnected by said or each finger exoskeleton; wherein said quick coupling means comprises a transmission element steadily connected to said or each inner cable, said transmission element arranged to connect to said fastening link in a reversible manner by means of an interlocking constraint; and wherein, in said actuated configuration, said transmission element is connected to said fastening link and said interlocking constraint is arranged to transmit said actuation torque M from said actuation unit to said fastening link rotating said fastening link about said rotation axis x. - at least one finger exoskeleton comprising n ≥ 1 rotational joints and m ≥ 1 link arranged to rotate by means of respective rotational joints, said n ≥ 1 rotational joints comprising a fastening rotational joint arranged to allow the rotation of a fastening link about a rotation axis x, said or each finger exoskeleton arranged to transmit an actuation torque M from said fastening link to said hand finger; - an actuation unit comprising: - an actuator adapted to generate said actuation torque M; - at least one Bowden cable comprising an inner cable and an outer coating, said or each Bowden cable arranged to transmit said actuation torque M to said or each finger exoskeleton; - a locking device having at least one opening arranged to constrain said outer coating of said Bowden cable and to allow said inner cable to slide; - an actuator adapted to generate said actuation torque M; - at least one Bowden cable comprising an inner cable and an outer coating, said or each Bowden cable arranged to transmit said actuation torque M to said or each finger exoskeleton; - a locking device having at least one opening arranged to constrain said outer coating of said Bowden cable and to allow said inner cable to slide; - quick coupling means arranged for causing said modular exoskeletal system to reversibly pass between an actuated configuration, wherein said actuation unit is connected to said or each finger exoskeleton, and a not actuated configuration, wherein said actuation unit is disconnected by said or each finger exoskeleton; wherein said quick coupling means comprises a transmission element steadily connected to said or each inner cable, said transmission element arranged to connect to said fastening link in a reversible manner by means of an interlocking constraint; and wherein, in said actuated configuration, said transmission element is connected to said fastening link and said interlocking constraint is arranged to transmit said actuation torque M from said actuation unit to said fastening link rotating said fastening link about said rotation axis x.