All the country flag patches offered in Globenir are sized 6.3 x 3.6 cm. They can be either ironed on or embroidered, according to your liking.
Here are the steps for attaching them:
Turn on your ironing machine to its highest heat setting to make sure the patch adheres properly to your fabric.
Place your patch on the marked spot on your fabric, place a thin cloth on top of your patch, and iron for 30 seconds.
Let it cool down for 30 seconds.
Repeat step 2 and 3 if the patch did not stick.
About the Flag "White, the color of the topmost horizontal band on the flag symbolizes peace and prosperity. The red color in the middle band and the vertical band of the flag represents the battles fought by the people of Oman against the foreign invaders. The green color represents the fertility of the land. The national emblem of the country depicts crossed swords over a dagger or khanjar.
Although the above meanings of the colors and symbols of the flag of Oman are officially accepted, the flag’s features have also been interpreted unofficially. According to such interpretations, white stands for the Imamate, red the Sultanate, and green is believed to represent the mountainous green interior of Oman." (source: worldatlas)