Astell&Kern SP4000T Case

The Black color case is crafted from soft cowhide by GRUPPO MASTROTTO, boasting a level of refinement befitting the prestige of the A&ultima SP4000T.

In particular, the leather delivers an exceptionally soft touch, with a uniform surface quality and a distinctively vibrant Italian coloration that further elevates the SP4000T's appearance.

Additionally, a standing mechanism on the back provides greater convenience in use.

Leather from GRUPPO MASTROTTO

GRUPPO MASTROTTO is a specialist leather manufacturer with over 60 years of heritage, founded in 1958 by the MASTROTTO family as 'Conceria Mastrotto' in Arzignano, Italy.

With more than 2,200 employees worldwide across 15 factories, the group produces high-quality leather through 18 rigorous processes and is one of Italy's three most prestigious leather conglomerates.

The Perfect Fit and Superior Grip_Olive

The Olive color case is crafted from premium vegetable-tanned leather by BADALASSI CARLO, boasting a level of refinement befitting the prestige of the A&ultima SP4000T.

Crafted through a proprietary tanning and dyeing process, the refined olive color further accentuates the SP4000T's signature luxurious character.

Additionally, a standing mechanism on the back provides greater convenience in use.

Leather from BADALASSI CARLO

Badalassi Carlo (Badalassi Carlo) is a tannery that has been producing leather for over 40 years, where CARLO BADALASSI — a former leather-school professor from the Santa Croce region — synthesized the traditional Tuscan vegetable tanning methods with his own theories and techniques.

Vegetable tanning is an eco-friendly leather-making process — slow and time-intensive — that tans hides using only plant-derived tannin extracts. Badalassi Carlo leathers employ the Tuscan vacchetta technique, adding tallow derived from bovine bone powder during the vegetable oil tanning process.

Pursuing small-batch, high-quality production over mass output, the workshop is highly regarded as the preferred leather artisan for renowned brands that place a premium on material quality.