The P7-4 offers the player an instrument that is well suited for symphonic and solo performance. The P7-4 features a .450-inch bore with a #8 taper copper bell with a full 180 degree radius bell bow for a broad sound that is free blowing plus a quick response with superior intonation. The P7 also features a 1st valve thumb saddle and a third valve slide ring for easy intonation adjustment.