A rock hard cock deserves a rock hard ring. Adorn your cock right with this hand-blown clear glass cock ring. The most effective cock ring on the market for keeping your cock rock hard longer. Nubbed design to ease in removal. Use with lubricant. 40mm e or approximately 1.57 inches inner diameter. Brand: Cocky Boys. Product Line: Glass Cock Rings. Category: Cock Rings. Dimensions Length 2.50 inches. Width 2.50 inches. Depth: 0.50 inch.Weight 0.90 ounce.