Opus Aria 35mm and 48mm Curtain Poles. The difference is Clear, the Aria collection is a luxury, hand-crafted, decorative wood curtain pole with stunning Clear finials that are highlighted with a choice of gilt and paint colours from the highly reputable Opus Studio. Opus Studio has built a reputation for innovation and quality among top designers, artists and sculptors, both nationally and internationally. Renowned for superb craftsmanship in the manufacture of high quality curtain poles and accessories, Opus Studio offers true handmade quality and attention to detail.