The Hammacher Schlemmer Institute tested the leading hair rollers, and these proved to be The Best because they heated evenly and were the easiest to use. Varying only 8º F from the hottest to the coldest, these rollers ensure smooth waves or tight curls without burning the scalp or damaging hair, unlike lesser rollers that had a temperature swing of 42º F. A ceramic core warms quickly to an average temperature of 187º F--up to 49º F higher than lesser models--and evenly distributes heat across the entire roller, ensuring long-lasting curls. Praised by panelists as the easiest to roll and clip, The Best Hair Rollers' velvet surface ensures easy removal from hair, unlike other models that pull or create tangles. The unit has a heat-ready dot that indicates when the rollers are ready for use. Includes 20 butterfly clips, 20 metal pins, eight large rollers, six medium rollers, and six small rollers. Plugs into AC. 12" L x 5 1/2" W x 4 3/4" H. (3 3/4 lbs.)