The Critter Wind-Up is like an old jeep with the mind of a mosquito; it needs occasional maintenance, tweaking and sometimes a drop of oil. Don?t worry, it?s all part of the fun! Two or more Critters make a Critter-jitter party. Made out of stainless steel w/rubber feet. Sold with a collector?s booklet. Collector?s item; not for children under 3 years old.