I used it with Roland's multi-effector GT-6. Assembled with A2017 duralumin plates secured with stainless steel screws. The sides and bottom have been processed for weight reduction, and a rubber mat is laid. It's sturdily built and weighs a heavy 6.5kg. No key, please check the photos for condition. Dimensions: 40cm x 55cm x 9cm (outer dimensions) Will be shipped via Easy Shipping Takkyubin, size 120. No claims, no returns, please.