The Ricorso is an 8 bar (115psi) training tyre. It's a skinwall with a wire bead. The centre tread is lined longitudinally, while the shoulders have a file pattern.
A smooth tread would be better but grip was okay - as was rolling performance. I wouldn't race on these tyres, but for riding to work or clocking up miles that would otherwise be wearing away your Sunday best tyres they're fine, and you can't argue with the price.
There's a harder rubber sub-tread - Vredestein's PRS system. This makes them tougher than unprotected race tyres and puts them in the league of street tyres like Kenda's Kwick Roller Sport, although some way short of C 180's Michelin Krylion Carbon or Panaracer Pasela TG, let alone glass-proof tyres such as Schwalbe's Marathon Plus.
But given that similarly priced training tyres to the Ricorso often have no puncture protection, this tyre is nothing to sniff at. It's available in a range of colours too, with red, blue, yellow or black or tan sidewalls.