Gator GBELLCVR2729BK Black Bell Cover with MERV 13 filter, 27-29 Inches 18 In a typical guitar amplifier

In a typical guitar amplifier

Available in four finishes and four button styles

however they are designed for the optimum range their dynamic shape can cover in the audio spectrum

and Walnut

Gator GBELLCVR2729BK Black Bell Cover with MERV 13 filter, 27-29 Inches 18 In a typical guitar amplifierWind Instrument Double Layer Cover for Bell Sizes Ranging from 27 to 29 Inches Black Color Wind Instrument Double Layer Cover for Bell Sizes Ranging from 27 to 29 Inches Black Color Made to Meet Performing Arts Aerosol Study Recommendations Covers Bell Opening of Instrument to Greatly Reduce the Spread of Aerosols Breathable Design with Little to No Back Pressure or Acoustic Loss During Performance Fits Sousaphone, Helicon & Contrabass Tuba Equipped