Here is an article and 4 questions about this article. I hope to receive your answer. Thanks!

Bounce Australia appoints James Wang to board, confirms Sam Stone as CEO Rubber product distributor Bounce Australia Ltd has welcomed Mr James Wang from its new substantial shareholder, Hong Kong-based Top Ltd, to the board, while also confirming its acting chief executive Sam Stone will stay in the role permanently. Top has been building its stake in Bounce while the company's share price has been weakened. Investors have mostly been fleeing the stock since late last year when Bounce was forced to downgrade its earnings guidance on account of issues affecting its strategy to sell rubber products in China. The troubles led to the termination of the company's CEO and a board dispute led by substantial shareholder John Smith, which resulted in the resignation of chairman Tom Price. Mr Smith's supporter Clint Wood is now chairman, but there are moves to find a replacement for him too. Top, led by founder and chief investment officer Mr James Wang, has emerged as a holder and sometimes agitator in a number of ASX-listed companies in recent times. The company has a holding in natural energy giant AusEnergy and was a shareholder in Shell Oil and Gas. Mr Wood said Mr Wang's skills and experience will help as Bounce reset its strategy. "He has deep experience investing in both China and Australia, including in consumer and energy sectors, and has been a director of publicly listed and private companies with strong governance experience," he said in a statement. As for Mr Stone, the former Bosch & Co partner who was appointed interim CEO in January, Mr Wood said he "has shown himself to be a highly focused and capable senior executive". Bounce also confirmed acting chief financial officer Lily Allen had also been confirmed as a permanent executive appointment. Shares in Bounce had lost 0.5 per cent to $4.10 at 11:15am on Thursday. The stock has struggled to trade significantly higher than a 12-month low of $3.70 hit in January and is well below a 12-month high of $12.99 hit last August.

1. Mr Wang is joining the board as a non-executive director - what is a non-executive director? Looking at the article what benefits will Mr Wang bring to the company? Generally, what are the justifications for the appointment of non-executive directors?

2. Bounce is a public listed company - what does this mean? What are some general characteristics of public listed companies?

3. The article suggests that the current chairman may be replaced - what role does the chairman play?

4. The article mentions that John Smith and Top Ltd are both substantial shareholders in Bounce (in terms of the Corporations Act this means they each have a "substantial holding") - what does this mean?