Kneeling rolls are available both filled and unfilled. The canvas rolls are only available in a diameter of 15 cm. The leather rolls in smooth leather or suede are available in diameters of 12 or 15 cm. Our standard roll in suede is available in a combination of blue and black in diameters of 12 and 15 cm.We have expanded our range of kneeling rolls to include the “Top Grip with Leather” version. The Top Grip material gives this model better grip all around the roll and makes it even firmer and is our top of the line kneeling roll. ModelTop Grip / leather, unfilled, 12 or 15 cmMaterialcowhide, Top-Grip (100% caoutchouc) Contact us at 70822-33324, if the product is in pre-order status.