The ProYo was developed and patented in 1974, and was the first yo-yo sold by Playmaxx. It had first entered production in 1976. Today, the current iteration of this yo-yo is still being produced by Duncan. With the introduction of the ProYo II, Playmaxx yo-yos rapidly became one of the best selling yo-yos around the world, with success in Australia, New Zealand, Singapore, Japan (as the Hyper Loop and Hyper Loop Glow in the Hyper Yo-Yo range), United Kingdom, Poland, Greece, Norway, Sweden, Italy, Finland, Canada, Denmark and many other countries.