This is a silicon-type hard disk case. It supports 3.5-inch HDDs. I purchased it new on Amazon in 2017. I'm selling it because I no longer use it. It seems you can stack up to 5 of them. The product name at the time of purchase was as follows: Greenhouse 3.5-inch HD Silicon Case White GH-CA-HD35W Greenhouse Bare Type 3.5-inch HDD Compatible Stackable Silicon Case White It is RoHS compliant. I will pack it and send it via Yu-Packet Post Mini. Please be aware of this.