The AHR 343H-O features a .460-inch bore with a Kruspe wrap and a 12-inch medium throat bell designed for quick response and excellent resonance. The 343H-O also features mechanical valve linkage for worry free maintenance. Amati represents the best value in student instruments on the market today. The AHR 343 double French horn is great for that player looking to advance. WIth its mechanical linkage, you never have to worry about the valve string breaking during a concert!