Gear

Some weapons/armors will have a special collection series made around it.

For example, some of the Armory Series are already partially upgraded as they have Glass/Wooden before their names. This means that there are other collectibles for the Glass/Wooden set available in the future.

Wooden Set is a collection of weapons/armors with the theme of Wood. There will be more Wooden weapons/armors in the future.

So to further elaborate, I'll spill the tea about the Wooden set. If you own any Wooden Weapon/Armor in the Wooden Set, u get a Wooden Gear!

Wooden Weapon + Wooden Armor = Wooden Gear

Therefore, if you have the Wooden Sword from the Wooden Set and a Wooden Chest piece from the Wooden Set, you'll get a Wooden Gear.

Thus, this goes for the Glass Set as well and many more upcoming sets in the future!