Good material and workmanship: steel constructed calibration weight with chrome plated finish for stability, corrosion resistance, and low magnetic susceptibility, good quality and durable. Each of our weights are Chrome plated. This feature contributes to longevity, durability. Please store your weights near the balance/ weighing scale. Please do not touch weights with bare hands. Clean your True 42 50g 50 gram weight often. Wide suitable occasion: suited for general laboratory, industrial, commercial, educational usage and so on.