Monofilament Screen Guard
manufactured by Novaplex, this device was used to protect an entrance or walkway from unwanted intrusion. Once activated, the screen guard extended a series of needle-sharp monofilament strands vertically upward for two meters. These strands had a high tensile strength, and literally shredded clothing and flesh which passed through them. The use of these screen guards was outlawed in many star systems, because they were extremely dangerous.