They can be worn in a number of different ways, each bringing its own sensations: As a regular cockring, with the point between your legs stimulating the perineum.

Turned round the other way so that your balls slap against the curve of the tongue.

Turned outward and down so when fucking the tongue presses into your balls.

Or experiment and find out what works best for you!

Tear drops are hand made, so there is occasionally a small variance in the diameter.