WiziWig pottery tools are unique and highly useful! WiziWig profile ribs work like a jig to create great and consistent mug, cup and bowl shapes.Using these potters ribs, you can easily make sets and repeatable forms. Depending on your wheel throwing techniques and the amount of clay you start with you can make thinner or wider forms than are suggested. Throw sets with ease, then decorate, glaze and fire ! These ribs are made of stiff and sturdy 18 gauge stainless steel. Each rib has two distinct profiles including foot detail and notches to smooth and finish your rim.