Right click on image tile and save to your hard drive.

 

Border will match at ends.
Right click on border and save to your hard drive.

 

This is a tube..with transparent background. 
I have added a drop shadow here for show. The actual tube does not have
a drop shadow. The ends will match if you put them end to end.

3 tubes here.
Click on image to download the zipped tubes in one file.