NEW PRODUCT and USED PRODUCT in custom field

[4n0n]

hi, i would like to create custom field (radio button, checkbox...), this field as a choice will be visible in backend and will have 2 possibilites (new product, used product). if i choose in backend NEW PRODUCT, in product detials will be visible NEW PRODUCT, the same way for USED PRODUCT. customer will see in product details one of these choices,  and cant change it. is it possible to make it in custom fields and how? thanks for all anwers.