Product Description 1/2" Premium Reflective Fire Glass for Fireplace and Fire Pit. Premium quality polished reflective glass! Tempered, safe and for indoor / outdoor use! 1/2" Fire Glass creates beautiful reflections of the flame Replace dated fire pit logs, lava rock and decor with a new modern look Fire glass is a versatile fire media that can be utilized in many different types of fire features, ranging from fire pits, fireplaces, fire bowls, home and vase decor and more! What makes this fire glass stand out from the rest is its reflective mirror like coating. It will add style and beauty to your fire feature! It is also very safe to use, and is the result of a special process which allows the glass to last a lifetime! Figure Out How Much Glass Is Needed: Fire pit & Fireplace Glass Formula (All measurements should be in inches) Round Firepit 1. Measure the diameter of fire pit. Refer to this as measurement A. 2. Square the number. A x A = B 3. Divide (B) by 25. B / 25 = C (25 is part of the formula used for all round firepits) 4. Multiply (C) by depth of glass. C x D = Total pounds of glass recommended Square and Rectangular Firepits 1. Measure Length and width of inside of fire pit to be filled. 2. Multiply two dimensions L x W = B 3. Divide (B) by 22.5. B/22.5 = C (22.5 is part of the formula) 4. Multiply (C) by depth of glass. C x D = Total pounds of glass recommended Fireplace 1. Measure the width of fireplace. Measure across the center not the front opening. 2. Multiply this dimension (A) by the depth of fireplace (B). A x B = C 3. Divide (C) by 20. C/20 = Z (20 is part of the formula for all size fireplaces) 4. Multiply (Z) by depth of glass. Z x D = Total pounds of glass recommended