Nice Anodized Aluminum case painted black for Raspberry Pi 3B+/3B motherboards. It comes with packing material in a plain white box so you can put your custom label on. Four screws hold the unit together, and inside a mounting screw holds your Pi board securely in place. The aluminum gives great heat dissipation for a fan-less operation. One time flat rate shipping of $5, no matter how many units you buy. Make an offer for 25+ pieces.