TJT released a new rear brake disc for Minarelli engines. It looks like a regular brake disc to me but it seems that they’ve added some magic on top. Here are the official words:

This disc is made of a stainless steel AISI 429,a special alloy that is used only in the highest competition and WRC and that although its high price, offers 23% more brake than conventional stainless steel used for brake discs.
It is an article that is born of the competition, and is made to meet the highest standards.
It is advisable to mount the brake pads TJT Kevlar.
49 € + VAT

I think especially the price makes this new rear disc brake interesting. Go get it at you local dealer! I am still awaiting the first (overpriced) floating rear disc brake release tho…