ID tag is entirely surgical stainless steel, stainless steel can endure wear due to its extreme hardness and resist acidity and alkalinity. Aluminum wear easily and cannot resist alkalinity. Two Side are smooth, both can be engraved, One pack of one blank tag, Great for ID , jewelry making. Feature: ID tag is entirely surgical stainless steel, stainless steel can endure wear due to its extreme hardness and resist acidity and alkalinity. Aluminum wear easily and cannot resist alkalinity. Two Side are smooth, both can be engraved, One pack of one blank tag, Great for ID , jewelry making. Condition: brand new Stainless Steel Color: Black & Gold & Sliver & Blue, Dimension: 28mm/1.1" width, 49mm/1.9"length, 1.8mm/0.07" thickness Quantity:1 Pc. Note: Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package Includes: 1 x ID Tag.