Features | These designer knobs boast a charming and classic smoked charcoal exterior with marked cursive hot and cold stamping, and feature smooth turning action that is sure to please. Design | The classic styling of these knobs is the perfect solution for updating your faucet hardware. These knobs are made using premium grade acrylic construction. Quality | These hot and cold knobs come with a durable and easy-to-turn design, which provides a desired smooth turning action, while preventing unwanted dripping. Installation | If you are concerned about adequate space on your faucet to accommodate these knobs, dont worry! They were made with your Dura Faucet units limited space in mind. Specifications | These knobs work with Dura Faucet DF-RK400 cartridges only. 1.9 tall. Dura Faucet is an American company with USA-Based customer service.