A toy includes a body of a shape of any animal, automobile, etc. and a roller
combined
with the body and a shaft. The roller is made of a mixture of TPR (thermal plastic
rubber) and white oil so as to give the roller some viscosity, having a plurality
of lengthwise convex protrusions formed on its outer circumference, The shaft extends
and fixed firmly in a center shaft hole formed in the roller, having two ends supported
by two plates fixed on an inner wall of the body to let the roller roll together
with the shaft. Then the toy can roll down on a slope or a vertical wall surface
with slow speed caused by the roller's viscosity and the convex protrusions.
