Joy Cubes were Korean 3x3x3 cubes. They were available around 2008-2010.
Joy cubes were sold by www.cubenjoy.com, a Korean cubing webstore. They were very hard to buy outside of South Korea, although they could be acquired from the Japanese puzzle company Tribox. Production ceased in 2010. It is possible that the manufacturer was Shin-Gwang-Sa, the Korean company responsible for the Edison cube.
Joy cubes were much lighter than Edison cubes, and were fast and crispy, although with a tendency to pop. It was well known for having very light turn resistance, making it ideal for One-Handed cubing.