could someone give me some classes for this and may be interfaces too ...?

You may need to be more specific in your question: I have not idea what you're asking.

I meant specific classes. We sell products. Each product could have different weight, color, material etc.. Each of it would have its price. The above are the tables in the backend.

I need to get classes in C# for the above tables.

Eg of products:

Product
-----------
1)Product 1
2)Product 2

 
Material
---------
1) Sand
2) Wax

Weight
--------
1) 100
2) 2000
3)50

Colors
-------
1) Black
2) Green

ProductSpefications
-------------------
1,1,1,1,1000.00
1,2,2,2,2000.00
2,1,1,1,1000.00

Users should be able to select a particular product, then a particular material and then a parituclar color so that they can make orders in the website. Also, we could be adding more products in the future.