# Attribute Tracking

### Overview

Attribute tracking has already been implemented and attributes are tracked during the generation of the NFTs themselves.

There are 10 asset classes as follows:

```
'Background'
'Skin'
'Markings'
'Eyes'
'Eyebrows'
'Tail Item'
'Mouth'
'Headwear'
'Clothing'
'Extras'
```

In general, for every asset class rolled, a snake may get an asset from the following groups.

**Common:** 40%

**Uncommon:** 25%

**Rare:** 15%

**Very Rare** 12.5%

**Sassy** 7.5%

These are just the chances to roll an asset in the group. The true rarity of individual assets will be known once the final NFT generation is complete. 

For example, if there are 5 'Sassy' level skins then each 'Sassy' level skin will be in approximately 7.5/5=1.5% of the collection 

At the time of writing, there are 140 unique assets excluding ones used in unique 1/1 pieces. More will be added prior to launch.


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