McDonald's is recalling fitness bands that were given out in Happy Meals because they could cause skin irritation or burns to children.

Last week, McDonald's stopped distributing the Step-iT bands, and now it's recalling the nearly 29 million of them that had already been distributed in the U.S. and the nearly 3.6 million that were distributed in Canada.

The Consumer Product Safety Commission reports that McDonald’s has received more than 70 reports of incidents, including seven reports of blisters, after wearing the wristbands.

This recall involves “Step-iT” activity wristbands, which come in two styles —“Activity Counter” and a motion-activated “Light-up Band.” The Activity Counter comes in translucent plastic orange, blue or green and features a digital screen that tracks a child’s steps or other movement. The Light-up Band comes in translucent plastic red, purple, or orange and blinks light with the child’s movement. Both styles of activity wristbands have a square face with the words “STEP-iT” printed on them and a button to depress and activate the wristband. The back of the square face contains the etched words “Made for McDonald’s.”

Consumers should immediately take the recalled wristbands from children and return them to any McDonald’s for a free replacement toy and either a yogurt tube or bag of apple slices.