Shiva Lingham Tumbles #1 measure approximately 1 1/8" to 1 1/2". Please let me pick one for you. These are $2.50 USD each.
(Healing Crystal)
Origin: India
Shiva Lingham is the name for the shape of these stones, not the crystal they are made out of. According to Melody, the actual name of these stones is Narmadeshvara Lingham. I believe the ones in the photo are Jasper, so the metaphysical properties of Jasper would also apply or the metaphysical properties of whatever other crystal they might be made of would apply. These are naturally tumbled in a river, the Narmado River in India, which is why they are so smooth. I would not be surprised if at least some of these were not actually tumbled in tumbling machines today and not produced in the natural way.
This stone works on the Kundalini, developing each Chakra as the serpent of Kundalini rises.