Master Model from Poland specializes in turned brass aftermarket details. In recent releases, they have added small resin pieces and small photo-etch parts making them a multi-media aftermarket supplier.
This particular set is devoted to the 1/48 P-40 fans, which many of us are. The set provides PE sighting rings (4x), sighting bead, pitot tube and pitot tip (resin), .30 cal browning cooling jackets (x4), and blasting tubes (x2). The blasting tubes can be installed with either a straight edge or with a tapered edge at the business end of the tube.
The pitot tube tip shape and the cooling jackets make this set appropriate for the P-40B/C in US service.