SKB's thin-width piano keyboard case features a polyethylene puzzle foam interior for a customized snug fit. Meets ATA CAT 1 specs as an airline shipping container and is fitted with tough, lockable security latches. The SKB-5817W has indestructible, built-in wheels. SKB is our premier supplier of instrument and gear cases. SKB builds their products with military-spec, ultrahigh molecular weight polyethylene and premium hardware. All SKB hardshell cases are unconditionally guaranteed forever. That means if you break it, they will repair or replace it at no cost to you.