This is a 2 ounce package of Serpentine (Ribbon) glass. Serpentine is not a "round" product like Vitrigraph Stringer, but has a flatter profile making it easier to see the different colors within. Please note, compatibility may not be absolute due to the high temperatures required to produce this glass. Mailing: packets are wrapped in bubble wrapped bags, with little or no breakage expected. We use USPS Priority Mail with average shipping being 2-5 days depending on your location. Please contact us for International Shipping rates or quantities not listed. Join our Facebook page @ https://www.facebook.com/groups/296027988484947/?ref=share