Against a backdrop of razor wire and machine guns, beauty therapists at Malaysia's first "jail spa" quietly tend to their customers under the watchful eye of uniformed wardens.
Despite the tight security, the innovative Balinese-decorated spa is doing a brisk trade while giving inmates at the country's biggest women's prison a trade they can turn to after their release.
"I am not afraid at all because I have faith that these prisoners are well trained to serve the customers and our safety is assured here," said Noor Aliza Osman, 45, who was on her second visit to the spa at Kajang Prison.