The 1981 Wal Mk I Active Fretless is a high‑end electric bass crafted with a solid mahogany body complemented by rosewood and maple accents, giving it both visual depth and tonal richness. Its neck is a five‑piece construction combining maple and rosewood — a design choice that enhances strength, stability, and sustain while offering a smooth playing feel. The fretless fingerboard, Royal Ebony, supports expressive slides and microtonal articulation, making the instrument well‑suited for jazz, fusion, even metal and nuanced low‑end work.

Electronics on the Mk I Active Fretless consist of Wal’s proprietary active pickup system, featuring hand‑wound humbucking pickups with a unique voiced character that emphasises clarity, punch, and dynamic response across all registers. The active preamp allows for precise tonal shaping, giving access to a broad spectrum of tones from deep, warm lows to articulate, focused highs. Controls include mid‑range frequency selection, boost/cut knobs, and overall volume, providing detailed control over the bass’s voice.

Hardware includes a solid bridge designed for stability and sustain, along with high‑quality tuners that maintain tuning accuracy even under heavy string tension. The absence of frets contributes to a distinctive, smooth tonal quality with natural vibrato and expressive intonation flexibility. The combination of premium woods, advanced electronics, and fretless design makes the 1981 Wal Mk I Active Fretless a sought‑after instrument for players seeking both precision and character in their bass tone.