Collectible coins, particularly in the United States, can include various types such as commemorative coins, bullion coins, and circulating coins from particular years, such as 2011. A roll of coins typically refers to a standardized quantity, often 50 coins, and can hold significant numismatic value, especially for dollars minted in certain years or with unique features. The 2011 series may include specific issues like the America the Beautiful quarters or presidential dollars, which are sought after by collectors for their design and historical significance. Collectors assess these coins based on factors like rarity, condition, and demand within the numismatic community.