Rice Stick (Banh Pho Kho) are flat Vietnamese rice noodles. The width can vary. Made from rice flour and water, they are white, becoming translucent when cooked. The noodles have no real flavour of their own, but they absorb other flavours well.
Vietnamese pho is a complete meal in a bowl. The broth serves as the soup, the rice noodles the starchy element, the meat as the protein, and the herb garnishing and the bean sprouts as the salad part. So you can make pho soup with Rice Stick (Banh Pho Kho) and Pho Soup Seasoning