The required magnets should be one neodymium ring magnet such as this example or this, along with one ceramic disk magnet, like this example or this one, according to Google. The magnets are approximately 0.75 inch (19mm) in diameter and 0.12 inch (3mm) thick.
The Velcro required for the VR devices includes two strips of regular strength adhesive-backed velcro, measuring about 0.75 inch (20mm) by 1.25 inch (30mm).
A rubber band with a minimum length of 3.2 inch is needed to prevent the phone from sliding out.
Users can also include an optional near-field communications (NFC) tag to contain information that can be used with the device.
Users can build the Cardboard unit with simple tools including a ruler, glue, scissors and an X-acto knife, according to Google.
The experimental VR Toolkit that users can use to build applications for the viewer includes a tutorial and provided documentation to get started. "Because this SDK is experimental, it won't receive the same level of support as core Android SDKs and libraries." Google advised.
The first Cardboard device was dreamed up and built by Googlers David Coz and Damien Henry at the Google Cultural Institute in Paris as part of a 20 percent project, where Google employees can use up to 20 percent of their work time to engage in projects that are interesting to them, according to Google. "The results elicited so many oohs and aahs that they inspired a larger group to work on an experimental SDK."
The Cardboard device will work with most modern Android phones, according to Google, including the Google Nexus 4 and 5, the Motorola Moto X, the Samsung Galaxy S4 and S5, and the Samsung Galaxy Nexus. The HTC One, Motorola Moto G and the Samsung Galaxy S3 are partially compatible. Phones must be running Android 4.1 (Jelly Bean) or higher versions and ideally should also support NFC, according to Google.
Virtual reality has been making its way into the tech vernacular for some time.
In March, Facebook moved into the virtual reality headset business by buying Oculus VR for about $1.9 billion in cash and common stock, according to an eWEEK report.
The Menlo Park, Calif.-based social network agreed to pay $400 million in cash and 23.1 million shares of the company's stock. At the March 25 closing price of $64.89, the stock changing hands in the deal was worth $1.5 billion. Oculus VR makes the Rift headset for 3D gaming and is based in Irvine, Calif. The company was founded in 2012 by Palmer Luckey, a self-described "virtual-reality enthusiast and hardware geek."
Google already has its Google Glass technology, which is an eyewear-mounted computer with an expanding range of apps and frames. In August 2013, Google began sharing some of its Glass devices with several film schools around the United States to see how they might inspire young filmmakers to use them. One of the schools that used the devices, the University of Southern California, even used them in some experiments with augmented reality, according to an eWEEK report.