1/2" (12.5mm) Fossilized Mammoth Ivory Floral Keystone WeightsThese measure about 2 1 8" tall and 1 1 2" wide. You must be 1 2" (12. 5mm) or larger to wear. These weigh approximately 23. 5 grams each. The insertion gap is approximately 5mm. This captivating material is 10,000 + years old and can have some slight cracking throughout which will not affect wearing. We cannot sell or ship this material to residents of Illinois, New York, New Jersey, California, Nevada and Hawaii.