This Lego Mindstorms Education set includes a Touch Sensor compatible with various Lego Mindstorms sets such as NXT 9797, 9843, 8527, and 8547. The sensor is made of durable plastic and weighs 2 oz. It is perfect for kids aged 9+ who are interested in robots and building with Lego. The set, which comes in a blister pack, includes 1 piece and belongs to the Harry Potter character family.