In using a guitar amp, it's important to know how to manipulate the amplifier to achieve a number of different effects, including a clean or dirty sound. Learn about using the bass and treble knobs on an amp with help from a professional guitarist in this free video on guitar amps.
A 10 X 13 envelope (must be less than 1/4 inch thick) is considered a flat and costs 80 cents for the first ounce and 17 cents for each fractional ounce after that up to 13 ounces.
1 Home > Ship & Postage. 2  Effective January 22, 2017 the cost for sending by Express Mail now has three seperate rates; a flat rate envelope (12-1/2 x 9-1/2) is $23.75, a padded envelope (12-1/2 x 9-1/2) is $24.95 and a legal envelope (15 x 9-1/2) is at $23.95.