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Representing the diversity of pens with their features exists in the real world.

1. Anything that can wrote is a pen
2. A pen has name, brand, price.
3. Pen types (Behaviour wise): Gel Pen, Fountain Pen, Ball Pen, Pin Point Pen
4. Pen types (Structure wise): Cap pen, Click Pen
5. Some pens have a refill(atmost one) and refillable
6. Fountain pens have no refill, instead ink is filled inside a body. So, pen has a nib in this case
7. The refill has a nib, Ink
8. A nib has radius of the tip
9. The ink is of different colors : Blue, Black, Red
10. The ink is of type: Normal Ink, Gel Ink
11. The ink has different features : Waterproof, Not waterproof.