Gu Feng, whose company has made around 500,000 sets of Wenlock and Mandeville, the London 2012 Olympic Games mascots, is worried as he looks ahead to the 2016 Games in Brazil.
The 55-year-old chairman of Yancheng Rainbow Arts and Crafts Co in East China's Jiangsu province said his plant is under pressure because of workers' pay rises and the depreciation of the US dollar.
Although this should be the peak season for selling toys, Gu's plant is not busy because of a shortage of new orders - except for the Olympic ones.
"We were lucky to get the Olympic orders this year. But who knows what will happen four years later in Rio de Janeiro?" he said.
"I mean, if the franchisee emphasizes nothing but low price, we might lose our advantage to the Southeast Asian countries where labor costs are low."
Gu started Rainbow 15 years ago, and it is now the oldest toy plant in the city of Yancheng.
Other toy plants that opened during the same period have closed down.
"When I started Rainbow, I had only 12 workers and seven sewing machines," Gu said.
"But the export demand was great, and we expanded quickly."
His business enjoyed enormous growth between 2002 and 2008, when market rules and the logistics system were improved in Yancheng, a coastal city.
In 2008, the plant had 157 million yuan (S$30.9 million) in export sales.
In the 2010 Olympic Winter Games in Vancouver, Canada, Gu sold 2 million stuffed mascots.
"When the mascot was unveiled, the organizing committee did not give out the manufacturing design, which meant we had to design the toy based on the image by ourselves," Gu said.
The design process was expensive.
Gu's designers changed a number of molds for example, to find a proper nose for the mascot, and each mold cost 3,000 yuan.
"Making the samples of a mascot named 'Mukmuk' alone cost over 50,000 yuan. We send the samples to Vancouver for adaptation, and it took more than 20 attempts to reach a satisfying result," he said.
Gu said the prolonged design process might have scared away some plants, but the experience helped him to win the order in London.
"Lucky for us, the franchisee of the London Games, a company named Golden Bear, focuses more on quality rather than the extra 2 or 3 yuan (apiece) they will pay," Gu said.
He sent a design team to London to discuss and determine the toy design, and after receiving a Golden Bear inspection team, obtained the order in a few months.