[TAKerry]

I love my dura blocks. I only have 3 I think, a small one, one about 6-8" long and one that is about 16" at least. As the devils advocate I have found that for body work I end up using the longest one the most. Works great on a long panel and the length lets you see the low spots in the finish better.

Years ago I started with those hard rubber blocks that the ends flipped open to reveal 'fangs' to grab the sandpaper ( I assume this is what you are using). There is a world of difference between the two. You wont be disappointed.

My paint store has the paper in a variety of lengths, I have no idea what brand they use but I have been happy with the results and ease of use of these.