A tape barrier, warning, or display composed of flexible material having generally parallel edges and substantially greater length than width with cuts made into the tape at intervals along the tape defining pennants and connecting bands. The magnet moment of the medical device can be created by one or more electromagnet coils, in which case the magnetic moment can be changed by changing the current to the coil. The cellulose containing material of the is at least partially carbamided with urea and phosphorylated with phosphoric acid or ammonium phosphate until a nitrogen content in the form of carbamide groups of 1 to 4% and a phosphorous content of 3 to 8% are reached.