The Arbiter AT (Advanced Tuning) series, conceptualized by Ivor Arbiter in the 1970s and 80s, is celebrated for its unique lugless design that utilized fiberglass shells in its original Autotune models. While later second-generation versions shifted to maple, the original vintage snares and kits used thick fiberglass coated with a specialized interior fiber or epoxy finish to achieve their massive, resonant projection. [1, 2, 3, 4]
Here is a breakdown of the materials and design:

• Shell Material: The original Arbiter Autotune drums used heavy fiberglass shells, often reinforced internally with a fiber-paint or epoxy-like finish to seal them and optimize the internal acoustic reflection.[1, 2, 3, 4]
• The "Auto-Tune" Mechanism: The most notable feature is the total lack of traditional tuning lugs. Instead, a specialized metal rim screws over the shell, allowing the entire head to be tensioned quickly and evenly using a single tuning point or cog. [1, 2, 3]
• Acoustic Signature: The rigid fiberglass and single-point tuning mechanism created a thunderous, dry sound. The combination of material and hardware made them notoriously loud, making them a popular choice for live rock and studio settings. [1, 2, 3, 4]
• Second Generation: In the 1990s, the "AT" series was re-released with Canadian Maple shells, but retained the signature rim-screw tuning mechanism