The Arnolds & Sons aS thumb rest for trombone ensures a relaxed, ergonomic hand position and supports fatigue-free playing, even during longer rehearsals and performances. The sturdy thumb rest comes with the appropriate tool and can be easily attached to the lower crossbar - suitable for trombones with a crossbar diameter of 10 mm and 11 mm. Advantages at a glance: Ergonomic handle for comfortable playing Relieves pressure on the thumb and prevents fatigue Easy to assemble with the included tools Suitable for trombones with 10 mm and 11 mm bridge diameter ???? Ideal for trombonists looking for more comfort and better control when playing. ELBBLECH is my heart project - an owner-managed specialist shop for wind and string instruments with its own workshop in Mölln (Schleswig-Holst.