Disclosed herein is a magnetically detectable glove comprising at least one layer of a polymeric material that includes coated iron oxide nanoparticles, wherein the coated iron oxide nanoparticles are present in an amount of from 5 to 25 per hundred parts of the material, wherein the coated iron oxide nanoparticles are >90% magnetite; have a particle diameter size of from 6 to 25 nm; and have a magnetisation strength (Ms) of from 62 to 75 emu/g.