Glass earrings are covered with a green-blue, dichroic cellular pattern (back is black glass). The earwire is "slip-less," as it is made with twisted Sterling Silver wire. The bails (the metal the earrings hang from) are Silver-Plated. All the glass has been tested compatible and is of the same COE (coefficient of expansion). After fusing multiple layers of glass together at around 1600 degrees, I allowed the glass to cool for several hours. This is called kiln-annealing and makes my product as strong as possible. The earrings measure approximately 2" long (excluding the earwire) and 3/8" wide.