Silver bars are a popular and common way to invest in silver bullion. Silver bars come in many different weights and sizes and are produced by numerous companies. Ten-ounce silver bars are heavily sought after because they serve as an ideal middle ground between smaller investments (1 oz. and 5 oz.) and large investments (kilo and 100 oz. bars). Mints from around the world manufacture and distribute silver bars. The bars are stamped with unique images or logos. The most important considerations for silver bar collectors and investors are the weight and purity of the bar under consideration.