# size class

URL: https://blockspace.wiki/glossary/size-class/

block.space's label for an [inscription](https://blockspace.wiki/glossary/inscription/) by the size of its content. **Large** is over 400,000 bytes, "bigger than standard relay allows; mined by direct submission" (see [standard transaction](https://blockspace.wiki/glossary/standard-transaction/)). **[whole-block](https://blockspace.wiki/glossary/whole-block/)** is over 3,500,000 bytes, and every whole-block inscription is also Large. Space Blocks, at 1,047,584 bytes, is Large.

Sources:

- block.space: the largest inscriptions, with the Large and whole-block classes · https://block.space/largest-inscriptions
- Blockspace Holdings records

Updated: 2026-10-20