Adams Endurance Series Marimbas are designed for maximum strength and durability, allowing for easy transport across any field or concert stage. Featuring solid steel accessory rails, large rubber field wheels, and precision height adjustability, Endurance Marimbas provide the bottom end for any ensemble while standing up to years of hard playing, weather, and loading. Available in 4.3, 4.6, and 5.0 octave configurations. Only the finest aged Honduras Rosewood is considered for the keyboard which is then tuned via the Alpha Tuning Method producing not only the perfect fundamental note but the perfect harmonic structure throughout the upper register. The resonators found on all Endurance Series Marimbas are structurally welded for the utmost in strength and isolation from mechanical noises. Each structurally welded resonator tube is carefully designed to amplify the fundamental note and give you maximum volume, sustain and clarity. Lower register resonators are tunable and each resonator system is mounted on a rubber isolation system to ensure the maximum resonance and eliminate all possible mechanical noise.