Weights are sold individually for and mailed in a small flat rate priority box (all four can fit in that box). The CP weights are not chipped and can be used for portable beam scale slotted weights or for testing small scales. Brand new weights sell for about . The 1# 15 1/2 oz. item is not a calibration weight but a back balance or dead weight. The two weights are 4 1/2" dia.; the 100# is 3" dia.; the dead wt. is 3 3/4" dia.