Looms bands for sale in Wales are being tested to see if they contain harmful levels of toxic chemicals.
Carmarthenshire's Trading Standards says it's awaiting test results and warning parents to be careful when purchasing the bright coloured elastic bands that are popular with children all over the world.
Thousands of children have become hooked on the loom band craze, making bracelets, necklaces and trinkets either using their fingers or a plastic loom to twist and link them together.
Trading Standards says it has found a number of bands, particularly of cheap or low quality, that have been bought locally and do not comply with the Toy Safety Regulations 2011 in terms of labelling and warnings.
A number have been sent for chemical analysis, with particular concern that they may contain toxic levels of phthalates – a substance which is used to make plastic safer and pliable, but is strictly controlled as they can migrate from plastic into the body if it comes into contact with saliva or sweat.