National flag of India

The National Flag is a horizontal tricolour of deep saffron (kesaria) at the top, white in the middle and dark green at the bottom in equal proportion. The ratio of width of the flag to its length is two to three. In the centre of the white band is a navy-blue wheel which represents the chakra.
The top saffron colour, indicates the strength and courage of the country. The white middle band indicates peace and truth with Dharma Chakra. The green shows the fertility, growth and auspiciousness of the land.
Its design is that of the wheel which appears on the abacus of the Sarnath Lion Capital of Ashoka. Its diameter approximates to the width of the white band and it has 24 spokes. The design of the National Flag was adopted by the Constituent Assembly of India on 22 July 1947.

The flag, by law, is to be made of khadi, a special type of hand-spun cloth, or silk made popular by Mahatma Gandhi. The manufacturing process and specifications for the flag are laid out by the Bureau of Indian Standards. The right to manufacture the flag is held by the Khadi Development and Village Industries Commission, who allocate it to the regional groups. As of 2009, the Karnataka Khadi Gramodyoga Samyukta Sangha was the sole manufacturer of the flag.

More Info : http://knowindia.gov.in/myindia/myindia_frame.php?id=4