Winmau Darts Astro Aluminum Intermediate Blue 41mm. This is the one. .What. The brand is Winmau Darts. Size: Intermediate 41 mm (not including thread). The model is Astro. The material is aluminium. Color: blue. .What. The product consists of 1 set of 3 Winmau Astro Aluminium rods, including rubber in the thread for better dart grip.