This speaker case is perfect for Storing two MACKIE SRM450 speakers. Since it’s made on special interior size, it would hold Two MACKIE SRM450 speakers perfectly in the case. This case has a hinged lid and 4 rugged casters on the bottom, which would be easy for you to move your heavy speakers anywhere. It is constructed of 3/8" Yellow plywood with black hardware covering. This professional speaker flight case has a hard shell with internal impact resistant padding to provide the best protection for your investment. No matter where you take your speakers you can have peace of mind nothing will get damaged during transit or in storage, and also, this particular case rests on four high quality 4" casters designed for easy traveling.