Cambium saver with steel thimble. The fImblSAVER from TEUFELBERGER is a cambium saver provided with steel thimbles. It is the perfect tool for tree care operations in canopies. The friction values are only slightly higher than those encountered with the pulleySAVER. The 10cm long tapered longitudinal seam makes retrieving this cambium saver simple.Since the fImblSAVER is easy to install from the ground, it closes the gap between the multiSAVER and the pulleySAVER.