We are currently re-designing the 9" QUBE.  (In the meantime we have the Leather Elite QUBE, and 8" QUBE readily available).  We do have a small number of 'light' 9" QUBEs available.  These units are 34" in circumference but weigh 15-16 ounces vs 19-21 ounces for the regular 9" QUBE. It's made from the same proprietary EPE foam.  It's dense, durable, and can be used on any surface.  It's a great template for teaching players proper hand positioning and elbow wrist alignment...it's just slightly lighter and can be used with or without a rim.