Ikea Antilop high chair accessory

Suitable for Ikea Antilop or similar design high chairs. This aid greatly eases daily life. More or less, food doesn't get dropped on the floor; everything falls into a kind of large bowl. After eating, it's easy to clean the dining area. I bought two sets, but one remains unused. The item is in its original packaging and shouldn't be folded, so self-collection or we can arrange a reasonable meeting place in Riga.