Convoluted wafers have a wavy, convoluted design. The inside ring of the wafer gets pressed to make the convoluted shape. There are no spacers needed with convoluted wafer.  There is, however, a specific way they need to be installed. Once you get the placement right, convoluted wafers are much easier to install as there is no need for a spacer.

Brosses circulaires à profil plat pour balayeuses, avec âme et matériau de remplissage synthétiques. Disponibles avec des diamètres d'âme et de brosse standard pour s'adapter à toutes les machines courantes.