This snap-on dent guard is made from high-impact plastic. Use it to protect your trumpet's bell crook from dents. Custom taper is made to fit most models by Bach and Getzen, plus others with similar geometry. Can be adjusted by a repair technician. • Protects the vulnerable bell crook at the rear of the horn from bumps and scrapes. • Fits most Bach and Getzen models, plus others with similar geometry. • Ideal for marching band or pep band situations. • Adjustable for optimum fit by your repair technician. • Does not affect quality of sound.