9 Pre-recorded CD's, video tapes, laser disks and DVD's featuring education and instruction in the field of mechanical trades, namely, locksmithing, welding, plumbing, and machine shop; Prerecorded digital video disks featuring education and instruction in the field of mechanical trades, namely, locksmithing, welding, plumbing, and machine shop; Prerecorded video tapes featuring education and instruction in the field of mechanical trades, namely, locksmithing, welding, plumbing, and machine shop