An article has a wall with {HEAD ~ a first, continuous region} and a second, smaller region on the first region and integrally mereged with the first region thereat, {TAIL ~ both wall regions} being made of PVC materials for so integrally merging by the common PVC constituent thereof in the process of forming the regions one on the other 
An article has a wall with { HEAD ~ a first , continuous region } and a second , smaller region on the first region and integrally mereged with the first region thereat , { TAIL ~ both wall regions } being made of PVC materials for so integrally merging by the common PVC constituent thereof in the process of forming the regions one on the other
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH