YUSHI step blocks packed in carton. Standard Material of the 5 step pipe blocks is 1018 Carbon Steel If the material of Stainless Steel needed, please contact me to get new price of it. Optional 2 models, 120 Curved 5 Step Thickness Calibration Pipe Test Block, leave messages which models you ordered please, thanks. Will delivery according to the clients' actual order model, confirm well the ut block Standard and parameter when buying. Noted please. Thanks.