There is no charge for the cap IF we receive both the salt and pepper caps from both shaker pieces. We will gladly credit your account for defective glass upon receipt of the defective items. Any bubbles or small imperfections in the surface of the glass are natural flaws in the colors and are not defects. They simply add to the character of the art piece. Nothing is made in a mold.
Any impact can cause glass to crack or break.
If the bottle has a hole or crack where the stem was connected, it is not a defect, it is an impact break. The connections between the stem and bottle is the most likely location of an impact break due to the differences in thickness of the glass at that joint.