The Jade Pearl Turbo finial averages three inches tall. Like other “turbo shells,” they are found in the tropics. Their range is from the Indian Ocean east to the northern shores of Australia. Turbo shells belong to the gastropod family of shells (animal/mollusk) living inside the shell creates a single shell. These shells are top shaped. The aperture is pearly. As with all of our finials, the shell is mounted on an independent swivel, so it can be spun to any position.