ACOUSTIC REVIVE DBP-3 Acoustic Revive Insulator Good Condition Some scratches, but normal use is possible. Thank you very much. [Specifications] Quantity: Set of 3 Material: 2017 Aircraft-grade Aluminum Alloy + Brass Diameter: φ38mm [Details/Features] Spike Coupling Insulator. The golden ratio is adopted for all dimensional ratios, and the cutting direction of each material is strictly controlled. A hybrid structure that combines 2017 aircraft-grade aluminum alloy and brass, eliminating quirks and bringing out only the best of each sound.