The tongue barbell you can see here features a flat heart at the top of the barbell. The bar is 5/8" (16 mm) long and has an end ball on the other end. The heart is fixed and cannot be unscrewed. The end ball, on the other hand, can. The ball and the bar are the same color, and they are available in different colors, as you can see in the pictures above. Only the silver-color barbell is available with varying heart colors. 

The heart is held by four little prongs. No glue has been used, as liquids can dissolve it over time. The prongs aren't sharp, but they may disturb you if you like pushing your tongue barbell back and forth in your mouth.