I've worked on 1000's of clarinets and I consider these Vitos and Leblancs to be the best composite student clarinet ever made. This clarinet has a fresh mechanical overhaul done here in shop. Everything except the body and keys have been replaced including all the pads, all the tenon corks and all the key corks.  It doesn't do much good to have new pads if they aren't really air tight though. While anyone can replace pads, very few do it well and this one is done very well. You do not have to take my word for it. A magnahelic is a machine accurately measures how well a wind instrument seals. 

This one measures a very respectable 0.8 on the upper joint and 1.5 on the lower joint. 

Vito Clarinet