nope, that's a standard iso, the same one i just bought from Bob last week.
shielded matters especially when the iso needs to go somewhere near the monitor like in a cocktail, in some cabs with very low-seated monitors, or where the transformer needs to be up higher in the cab. in such a situation an unshielded transformer will cause color issues like a speaker (since it's essentially a big electro-magnet.)
can't find any at the usual places; there is one used one for sale on eBay (for a Space Invaders cocktail; should work for pretty much any monitor,) but it'd cost you at least $35 after shipping.