I am looking at the different heat shrink tubing at http://www.cableorganizer.com and I am a little confused on what I need. All I am looking to do is to make some neat, sealed ends for my speaker wires. I will be using crimp on banana clips and the wire is 12 gauge. What diameter should I use and what type. The different types are....

2:1 Standard Wall Polyolefin HST
2:1 Adhesive-Lined HST

3:1 Standard Wall Polyolefin HST
3:1 Adhesive-Lined HST

4:1 Standard Wall Polyefin HST
4:1 Adhesive-Lined HST