Add attributes for product no base price

How to set/add attributes for one product does not has a base price, but 5 different sizes with different prices? Any suggestion better than using drop down menu?

I did not find same question by brief search. Any helps would be appreciated.

You have Dropdowns or Radiobuttons that usually work best ...

I would also recommend setting up an extra Option Value such as:
Option Value Name: Select a Size ... (your wording can be anything)
Sort Order 0
Default YES
Display Only YES

This forces the user to make a valid selection and not accidentally pick the wrong size ...

hara:

... product does not has a base price, but 5 different sizes with different prices

In the product's EDIT SCREEN, you give it a price of 0.00

You will also see a radio-button YES / NO selector on that screen that says "PRODUCT IS PRICED BY ATTRIBUTE". select YES.

Then, when you add the SIZE Option Values, you need to give each one their PRICE. You will see a field for PRICE on the large grey box in attribute controller.

You select each option value, and insert the price for each one.

Actually I'm missing my major question in beginning. How can I have quantity inventory counts for each size in this attribute setting?

I did "schoolboy"s advising.

You need something like the Stock by Attributes mod for inventory control by attribute.

Yes, got it. thank you all.