sentences:  Beyond the basic profiles or contours (smoothwall, corrugated, or ribbed), innerduct is also available in an increasing variety of multiduct designs.Multiduct may be either a composite unit consisting of up to four or six individual innerducts that are held together by some mechanical means, or a single extruded product having multiple channels through which to pull several cables.In either case, the multiduct is coilable, and can be pulled into existing conduit in a manner similar to that of conventional innerduct.