There’s another thread about this if you want to search for it, but steel Explosifs were made of Tange Prestige Concept from 90 to 92, Tange Prestige Ultimate in 93 and 94, Columbus Max from 95 to 97, Reynolds 853 in 98 and 99, True Temper OX in 02 and 03 and Dedacciai COM from 04 to 08. The Kilaueas from 93 to 95 were also made of Concept, so very similar to the earlier Explosifs. The geometry was ‘suspension-adjusted’ from 94 onwards.
The Tange Ultimate and Columbus Max frames were the lightest, if that’s what you’re looking for. After that they got steadily heavier, as their intended role moved further and further away from xc racing and into general xc. Columbus Max was the most sophisticated and expensive tubeset they used for Explosifs, and the biovalising combined with thin gauge tubes gives a very stiff/light front triangle. Those frames may be the most valuable in the market, but it’s all a matter of taste as to which type has the characteristics you’re looking for.