GUNJAN Reflex Horns & Trumpet Horns are made from heavy duty Aluminum Circles, casted parts and heavy duty steel bracket to withstand conditions of extreme stress, strain & vibrations. These are acoustically well designed & are fully matched to GUNJAN Driver Units to ensure reproduction & dispersion of powerful & clear sound. Horns with large Bell dia (21") should be selected for use with High power Driver Units like GDUF 40 GDUF 70 etc.