1/2" (12.5mm) Carved Fossilized Mammoth Ivory Split WeightsThese measure about 2 3 8" tall and 1 13 16" wide. You must be 1 2" (12. 5mm) or larger to wear. These are approximately 3mm thick. These weigh approximately 7 grams each. These are 2. 5mm thick. 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.