The main item is not included. This is something to add height. Cannot be used alone. I entered 24 because the size was required for the listing, but the main item is not included, and this is only for adding height, so there is no size. This is a heel-up insole that reduces the burden on your feet with shock-absorbing material and supports comfortable walking. It was a product that allowed for height adjustment and customization to your preferred height, but I will not be using it.