Hexagonal micro-engraved silver bullion. Deep micro-engraving, which is a newer high tech method not seen too often in the bullion world - https://www.youtube.com/watch?v=uvZgogNHzJk https://www.apmex.com/product/94239/10-oz-silver-hexagon-snowflake Another example of micro-engraving on a coin, done with a computerized laser. These coins were made for the Cook Islands by the CIT Mint of Germany - https://www.youtube.com/watch?v=d214bE2RJ-0