Some tags are stuck onto merchandise with glue (rather than being superimposed on) the shoplifter can easily scrape off the tag in their pocket. Pedestal EAS covers, which are made of durable vinyl, offer cost-effective means of adding a marketing tool at every entrance to a store; they are also custom-manufactured to fit any pedestal and can be printed to highlight specific brands or seasonal promotions. They do not interfere with the performance of the EAS systems and are easily cleaned or changed. Some shoplifters may employ jammer devices to prevent EAS tags from triggering, or magnets to remove the tags. Stores may employ technology to detect jammers and magnets.