Simply put, PRO FX is a chopped (flat) Classic Pro. These models have the same 32-inch x 16-inch (81.2 cm x 40.6 cm) mounting surface, five-rail design, and rail spacing. The benefit of the PRO FX's low-profile design is that you can mount very large items, including high-level devices and built-in expression pedals, and there's plenty of headroom left inside the soft case for comfortable transport. The flat design provides perfect ergonomics for expression pedal control. There's plenty of space underneath the PRO FX to organize cables and route DC power. If it fits the Nano or Metro, it will also fit the PRO FX. Please note that larger traditional power bricks will not fit under this device. Features All-new platinum SBS zippers with enhanced pull tabs. The zips are smooth, buttery and satisfying. Zipper nerds will love them! The case depth is boosted to 6” or 15cm (including lid height) so you have more headroom than ever. The shoulder strap and connections are the best we’ve ever offered. The strap features robust, washer-less, clasps. These clasps were repetitive machine stress-tested to 44 lbs (20kg) each. Pedaltrain matched these clasps with a new padded and extra comfy shoulder pad, borrowed from our premium soft case line. The strap connects to the case via new sure-grip triangular metallic hooks. The hooks are double-reinforced at the case with durable codura nylon. Water resistant shell and easy-wipe inner liner. Included: PRO FX Pedal Board Soft Case with Premium Shoulder Strap 176 of matched Hook-and-Loop Assortment of zip ties