The graduated pole strap apparatus can be wrapped around a pole, tree or the like and secured on each end to the rails of a ladder. The compositions may be utilized to selectively deliver payloads within patients by responding to lower pH andor ROS at localities within the patient. The second part has a counter portion with a curvature that generally parallels the curvature of the generally arc-shaped deformable portion of the elastic element. To tautly mount the flexible material sign to the billboard structure, the brackets are secured to the billboard structure with fasteners.