In twin roll casting of steel strip, molten steel is introduced into the nip between parallel casting rolls to create a casting pool supported on casting surfaces of the rolls and the rolls are rotated to deliver solidified strip downwardly from the nip. The device will function as a nipple prosthesis, nipple enhancer or a nipple protector. The invention provides added functionality such as increased ruggedness and durability, while providing an integrated system in association with a handheld host device, to provide the convenience of a one-piece form-factor, without sacrificing universality of the solution.