Is it the INFINI ones you mean Barry.
I am pleased with the ones from Flex-i-file. Last a long time not to expensive and can be bought separate or in sets. They also have shaped ones.
Scale Model Shop Flex-i-File Discount Models and Accessories, Live Stock Levels, Fast UK Delivery, Free Delivery Available
www.scalemodelshop.co.uk
Infiny produce a whole range of products and I have the full set
Large square sanding sponges covering a range of grits. These are used cut into small pieces to get into tight areas, often held in tweezers.
Sanding sponge ‘sticks’, again in a variety of grits. These are large and are my ‘go to’ for seams at least after an initial ‘rub’ with a harder sanding stick.
Speaking of ‘hard’ sanding sticks they do two types, in two sizes, the grits are different for each, the smaller go up to 7000 grit while the larger are a courser grit range. These have many uses such as running a larger fine stick over ‘clamshell’ parts to get a better cleaner join or giving seams an initial ‘rub’.
Then they have their ‘elastic’ sanding sheets. These are really just like high quality wet and dry paper. I did not think I would get much use out of these but there are situations I find them handy.
For getting into hard to reach places they do these metal files in various shapes onto which you stick self adhesive sanding paper that come in a variety of grits. Another I find a lot of use for.
Next up are their metal files in three ‘grits’. These I find useful in shaping perhaps a cavity I drilled into a square. I recommend not using these for etch, a specialist etch file from
Tamiya cannot be beaten for that.
Then there are their glass files in two sizes and three grits. These are the very best you can get for removing sprue attachment hubs. They almost polish the nub off the part, removing material slowly reducing the risk of over sanding.
All in all I use most of these on every build. All have their place and being high quality, can easily be cleaned off, perhaps under water, for reuse.
I have given up on the previous sanding sticks, skinny sticks and sponges after trying these and getting the full set. It was quite an investment to stock up but they last really well and may well work out cheaper in the long run.
Incidentally, I also have my David electric sander which also has its uses but is much less useful than all the above.