Glass plug features a smooth small tapered head, followed by a slender neck, and bubble followed by another slender neck the end is shaped like a heart to prevent toy getting lost up there. Plus helps with easy use and retrieval. Run the plug under warm water or place it in the microwave to heat things up. Chill it under cold water or put it in the freezer for a cool sensation. Insertable length 2.5 inches, width 1.3 inches.
