Many thanks for replies everyone, they are shoulder inertia straps, I should have mentioned in the opening post, they seemed to have lost the power to retract, I knew they were going to be swapped but wasn't aware of the cost. But now I feel a lot better about the situation! I just didn't know the going rate, I was chatting to someone on Sunday and he said the Cessna he has a share in had the inertia reels changed because they have a lifetime on them, seems a bit harsh, although there must be a reason for it? I can imagine the airtime on some taken out due to age can vary massively.
Thanks again, Jim