Cufflinks by Gail Klevan Chunky square acrylic cufflinks with fixed bar. Features Primary Material : Acrylic Other Materials : silver plate Fitting Type : fixed bar Dimensions (mm) : 15x15x5 One of a Kind : No Hallmarked : No Cleaning InstructionsClean with soap and water, do not use perfumes/hairsprays/suntan lotion/insect repellent near jewellery.Very important: do not clean with methylated spirits.