Polyurethane marine cable bending restrictor is also called polyurethane optical cable limiter, submarine cable bending limiter, and submarine cable protective sleeve, which is a protection device applied to submarine cable channels! Ocean cable bending limiters are used to protect flexible pipes from excessive bending and bending caused by static loads during their installation or operation. The system includes multiple interlocking elements that are hinged together. At the design radius, the element is mechanically locked to form a semi-rigid curved structure that will not move further.