(Harrisburg) -- With the arrival of the holiday season, it’s buyer beware for toy shoppers. A Philadelphia-based research group has issued its annual look at potentially dangerous toys on the store shelves. For years, the Pennsylvania Public Interest Research Group has been sending its researchers to toy stores to gather up potentially dangerous items and take them to the lab for testing. Despite recent federal restrictions on the level of chemicals allowed in children’s toys, some still come back toxic. "And like that cute little mask. You know, you go to a sleepover and take it with you," she says. Sue Rzucidlo, with the Penn State Hershey Children’s Hospital, is holding a kid’s sleeping mask that contains high levels of phthalates, a chemical used to soften plastic. Vanessa Wright, with PennPIRG, says online databases list the toys that have been proven to have high concentrations of harmful chemicals. She says choke hazard tests can be done by shoppers. "My advice for parents is first of all, to use a choke tube for children or use a toilet paper roll," she says. "Test if things can actually, are too small for your children, if they could choke on them. " Find a list of potential dangers and recalled toys online, at http://www.saferproducts.gov/. Already browsing the toy shelves and want some guidance? The smart phone-friendly website, http://toysafety.mobi/, has lists of unsafe toys and potential hazards for kids of different ages.