To your gas fireplace or fire pit. A modern alternative to gas logs! This listing is for 25 lbs of highest quality 3/8-1/2. (And if it can be used, you need to respect the recommended size and amount of fireglass). Please seek professional help with installation, especially if using propane gas as it can be very dangerous if not properly installed. About Fireglass: Fireglass is used in gas fireplaces and fire pits as an alternative to gas logs. The glass does not actually burn, so. You need to have a gas source. To create the flame. Fireglass can only be used in gas fire pits or wood-burning-rated vented gas fireplaces. Propane burners do not burn as clean as natural gas and can cause discoloration and sooting, so it is recommended to use dark colors with LP propane. Glass sizes are approximate. Some pieces can be quite smaller and some can be quite larger, this is typical of all kinds of fireglass. The shade/hue of the glass can change dramatically in different sources of light as well as in different colors of surrounding areas, backgrounds, etc. The image of this glass may be distorted by the settings of your viewing screen. To calculate how much glass you need. For rectangular or trapezoidal fireplace/fire pit: 1 Measure the width across the center of the firebox (in inches). 2 Multiply the result times the depth (inches) from the front to the back. 3 Divide the result by 20.5 4 Multiply the result by the number of inches high you would like the glass which should be at least enough to cover the top of your burner. 5 The result is the number of pounds needed (approximately). For round fire pits: 1 Divide the diameter (in inches) by 2. 2 Square the result. 3 Multiply the result by 0.15. 4 Multiply the result by the number of inches deep. 5 The result is the number of pounds needed (approximately). Note that 7.5 lbs of glass gives you a 1 inch layer covering 1 sq. Multiple packages do not always arrive on the same day. So please be patient with them, and thank you for understanding! For more colors and amounts, fireglass burners, and fire pit rings! The item “25 Lbs BAHAMA MIX FIREGLASS 3/8-1/2 Fireplace Glass Gas Fire Pit Glass Rocks” is in sale since Wednesday, February 27, 2013. This item is in the category “Home & Garden\Home Improvement\Heating, Cooling & Air\Fireplaces & Stoves\Decorative Logs, Stone & Glass”. The seller is “allfireglass” and is located in San Diego, California. This item can be shipped to United States.