Pupils at a north Wales high school have been banned from wearing charity wristbands over fears for their safety.
The wristbands have been made popular by celebrities
Teachers and governors at Denbigh High School said the colourful bands, which promote issues including anti-bullying were a hazard in the classroom.
The awareness bracelets have been made popular by celebrities including footballer David Beckham.
However, Denbigh High School said they contravene their rules on uniform.
Pupils and parents were informed of the school's decision in a recent newsletter - and the bands will be confiscated if any are worn from Monday.
Head teacher Alison Duncan said the bands broke the school's policy to restrict the wearing of jewellery and also its health and safety rules.
There had been a mixed reaction from pupils, while the issue had been used as a debating topic in a Welsh class.
"I've had two petitions from pupils against it and a letter from one girl and I've had youngsters stopping me in the corridors to talk about it," she said.
"I'm sure there is demand for them because they are fashionable but for many youngsters it is a real effort for charity. My main concern though is that it doesn't fit with either our health and safety or jewellery policy."
Clwyd Parry, chair of governors, said: "They are very strong and very tough and could cause a hazard during PE, outside activities, arts and crafts and engineering."
Denbigh High is not the only school in Wales to ban the charity wristbands because of health and safety worries.
In February a 15-year-old was banned from wearing a colourful bracelet by teachers at Monmouth Comprehensive School in south Wales.
Samantha Willis wore her plastic band after a cancer scare. She discovered a benign cyst and decided to wear a yellow bracelet to show support for the cancer foundation set up by cyclist Lance Armstrong.
Tour de France champion Armstrong launched his foundation after surviving a life-threatening battle with testicular cancer.
However, staff at Monmouth Comprehensive warned Samantha and her friends that their bands would be confiscated if they continued to wear them.