Crystal Premium Glass Large Eggs Blue. These artistic gems are made from 100% Borosilicate glass, and are designed to bring pleasure to PC muscle exercises. Once inserted, they will help strengthen the Kegel muscle, while providing rippling effects of stimulation. At a larger 2 inches long by 1.25 inches, these eggs are a delicious, yet discreet item. Crystal premium glass eggs include a silk storage bag and a detailed instruction manual that outlines PC muscle exercises designed to give pleasure and maintain healthy muscle control. Bulk weight 2.15 ounces. Crystal Premium Glass Large Eggs Blue from New Sensations Novelties.