The two strips on the left side cut the track into the paper. The "t" shaped image is the piece that runs in the track. The end of the "t" folds around the track, and then you attach the image to the top of the fold. The long rectangle piece is attached on the back of the paper to keep the "t" from flopping around. The shapes with the arrows are the pull part of the piece. The 3 pieces next to the "t" are used to cut out the arrow shape piece at the end of the paper.
If you are buying from outside of the UK you may now be charged additional fees/customs charges when the order arrives with you. Sadly I can not advise what these charges will be and I can not cover those fees for you.