In much of the world, the roadster is still the standard bicycle used for daily transportation. Mass-produced in Asia, they are exported in huge numbers (mainly from India, China, and Taiwan) to developing nations as far afield as Africa and Latin America. India's Hero Cycles and Eastman Industries are still two of the world's leading roadster manufacturers, while China's Flying Pigeon was the single most popular vehicle in worldwide use. Due to their relative affordability, the strength and durability of steel frames and forks and their ability to be repaired by welding, and the ability of these bicycles to carry heavy payloads, the roadster is generally by far the most common bicycle in use in developing nations, with a particular importance for those in rural areas. In parts of East Africa, the roadster is called the "Black Mamba", where it is used as a taxi by enterprising cyclist/drivers, called boda-boda. "Black Mambas" are often repaired, customized, and manufactured locally for low costs. To further reduce costs of the "Black Mamba", engineers have begun to test 3D printed bike parts that meet CEN standards.