The ebony between my SB+ metal cases is very nice - machined as spike and cup, others as domes to try.

I have just got some 1"x .25" discs. They are scarily powerful and I already have a nasty nip injury. My wife assures me I will not expire from a blood blister, but I am keeping them at a safe distance.

For a source of magnets Kevin at http://www.emovendo.net/ is very fast and helpful. In the US, but carriage is very fast.

Ian