Two sets of bowls for sale.

Today we were donated two sets of bowls. We have never been asked about bowls before or had any customers requesting them if some are donated. After speaking to the lady she informed us they are worth €40 euros minimum.
They are in good condition and it's seems they were purchased from the La Marina Bowls club.
The sizes of these bowls are.

1st set. Super Grip size 1.

2nd set. Heavy size 1.

These sizes make no sense to me at all. They are on sale for €40 euros a set. One set comes with the proper bowls bag the other is in a rucksack.