ZALMAN offers a compact PC case series with a height of about 460mm and a depth of about 400mm as a middle tower. Both have RGB LED functions, and acrylic or tempered glass is used on the side panels to accommodate dressing inside the case. The acrylic based one is called "S4 PLUS" and tempered glass version "S5"

The S4 PLUS is a low-priced model that uses acrylic panels on the sides. The front has a tri-cut design, and the mesh panel enhances airflow. Drive bay is 3.5 inch shadow bay x2, 2.5 inch shadow bay x1, cooling fan is 120mmx3 front (RGB LED fan x2 standard), rear 120mmx1 (RGB LED fan standard), top 120mm x2, bottom 120mm x2, water cooling radiator is front Up to 240mm and 120mm rear.

There are 7 expansion slots, the effective space is 315mm in length for a graphics card, 160mm in height for a CPU cooler, and 180mm in depth for a power supply unit. I / O ports are USB3.0x1, USB2.0x2, microphone x1, headphone x1. The body size is 206mm wide, 400mm deep, 458mm high and weighs about 3.7kg. Form factor supports ATX, MicroATX, Mini-ITX. 

The S5 series is a more high-end model that uses tempered glass on the side. The front is equipped with RGB strips, and there are two colors, black and white. The drive bay is 2.5 / 3.5 inch shadow bay x2, 2.5 inch shadow bay x4, cooling fan is 120mmx3 front (fan x1 standard), rear 120mmx1 (RGB LED fan standard), top 120 / 140mmx2, bottom 120mmx2, water cooling radiator is Applicable up to 240mm front and 240mm side (when using vertical mounting bracket). The expansion slot has seven levels, the effective space is 340mm in length for a graphics card, 163mm in height for a CPU cooler, and 190mm in depth for a power supply unit. I / O ports are USB3.0x1, USB2.0 x2, microphone x1, headphone x1. The body size is 212mm wide, 398mm deep, 465mm high, and weighs about 5.8kg. Form factor supports ATX, MicroATX, Mini-ITX.