A compound represented by the formula:wherein R1 is methoxy, methylthio, ethyl, etc. The clutch mechanism includes first and second clutch members rotating with the input and output members, respectively. The continuous tubing 11 is adapted to have items to be protected inserted into cavity 34 of the tubing 11 through the first opening 32. The entire assembly can be selectively power operated or locked into position using a clutch mechanism associated with the actuation system. External control devices including a keyboard and mouse may also control the UCS. The improved composite material may be useful as a replacement for lead and lead-based composites where similar densities are required but the use of lead is undesirable.