Medium weights weigh approximately 2.82 oz. (80 grams) a piece with a 2-1/8" diameter. The wearable surface measures approximately 6mm across and 7.3mm high -- you must be at least 00g to insert them.
Large weights weigh approximately 2.5 oz. (70 grams) a piece with a 2-1/2" diameter. The wearable surface measures approximately 8.6mm across and 7.6mm high -- you must be at least 7/16" to insert them.