 They tend to be thin on the outside and thicker on the inside, and they weigh between 0.4 grams and 1.7 grams with a diameter of 9 to 18 millimetres.The second variant of coin is similar to the aforementioned type but has no inner rim.These cash coins generally ranged from 8 to 13 millimetres in diameter and had a weight of 0.2 to 0.4 grams.