Looking for Nipple stretchers

Hi all, I’ve got a query! My roommate is curious; she’s wondering if anyone can tell her where to buy nipple stretchers similar to the ones pictured.

Kim already has pierced nipples so that shouldn’t be an issue.:D Her nipples currently stick out about ¼ inch, whereas mine are nearly flat—I barely have enough space to pierce them myself. She spotted these online and is keen on trying them to lengthen her nipples by between 1/8 and ¼ inches. Any tips would be appreciated. Thanks! Sin:whip: Image Image