# Evolution
One way to increase your earnings with Tektools is to evolve your **Toolbox**, you can increase the level of your **Toolbox** up to a max level of 10. **Increased levels earn higer rewards.**
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You can also personalize your Toolbox garage wall with NFTs of your choice, enhancing its appeal for yourself and others.\
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See below an updated and customized Level 3 Toolbox!
You can see 4 big collections and a sneak peak of our upcoming PFP in this customized toolbox.
**Leveling Process**:
To level up an NFT, holders need to stake NFTs to earn **$SALT** token.
Every 20 days, holders earn enough **$SALT** to evolve an NFT to the next level.
The progression yields a higher multiplier, maxing out at a 4x multiplier. For instance:
* Level 1-2: 1x multiplier
* Level 3-55: 2x multiplier
* Level 6-9: 3x multiplier
* Level 10: 4x multiplier
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