Alum block

Indeed, and is quite effective...

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I bought some of those from Holland and Barrett on some "Buy one get another one for a penny" deal.
For use on the face I prefer to take some sandpaper to the rounded top until it's flat. Still works for its intended purpose.
 
I bought some of those from Holland and Barrett on some "Buy one get another one for a penny" deal.
For use on the face I prefer to take some sandpaper to the rounded top until it's flat. Still works for its intended purpose.
If you do buy them from Holland & Barrett as I did, don't be afraid to give the pack a little gentle shake to check if the contents are broken - I went through nearly a whole shelf full before I got a solid one! (No, my 'shaking' did not break them LOL)
 
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