Green And Black Striped Jasper Keystone WeightsThese are about 1 7 16" (37mm) tall and 1 1 16" (28mm) wide. 6. 5mm insertion gap. These weigh about 21 grams each. All keystone weights are sold by the pair. The inner diameter is 1 2" (12. 5mm) You must be at least 9 16" (14mm) or larger to be able to insert these. All edges are nicely rounded for comfort and extreme care has been taken during the carving process.