Car exhaust is an unhealthy result of fossil fuel use. Photo Credit exhaust fulmes image by bilderbox from Fotolia.com. Fossil fuels are among the most commonly used forms of energy in the world. Common fossil fuels include natural gas, coal and petroleum, which is refined to create gasoline.Although fossil fuels are strong sources of energy, their use can pose certain health problems if handled incorrectly.ar exhaust is an unhealthy result of fossil fuel use. Photo Credit exhaust fulmes image by bilderbox from Fotolia.com. Fossil fuels are among the most commonly used forms of energy in the world. Common fossil fuels include natural gas, coal and petroleum, which is refined to create gasoline.
First-Class Mail International is a USPS trademark. Note: The cost of postage will appear on all international shipping labels. Maximum weight for letters is 3.5 ounces. Maximum weight for large envelopes is 4 pounds.
First-Class Mail is a USPS trademark. 1  The minimum size for First-Class Mail is 5 inches long, 3-1/2 inches high and 0.007 inches thick. 2  The maximum size is 11-1/2 inches long, 6-1/8 inches high, and .75 inches thick. 3  The maximum weight for letters is 3.5 ounces. The maximum weight for envelopes and packages is 16 ounces when you create and print your shipping label on eBay. You can send pieces over 16 ounces as Priority Mail (see below). For more information, please see First-Class Mail prices.