1. Cover is made by copper chromeplate, fluently written, easy change ballpoint durable used.                                            
2. arcylic crystal inside,shining!
3. Nand flash memory,the data will not be lost in case of the power off.
4. Available capacity: 1GB to 32GB
5. High speed,at least 10 years of data retention.
6. Metal box or paper gift box is available