According to About.com, 50 dimes are in a standard coin roll and constitute a $5 value. A half roll of dimes has 25 dimes with a $2.50 value, and a double roll of dimes has 100 dimes for a $10 value.
A regular roll is also called a shotgun roll. Like with dimes, 50 pennies also fit in a roll, but the value of a penny roll is 50 cents. Forty nickels for $2 fit in a roll, while 40 quarters comprise a roll, but at $10. A total of 20 half-dollar coins fit in a roll and make up $10 in value.