Tamiya Pulley Unit Set Educational Series

This is a Wheel System Set for Different Models.
    It's from Tamiya for extremely experienced design builders.

FEATURES:
Pulley-block set is developed to attach to a picked design set such as a
    leaping dophin, an elevator, a moving dog, alligator, or revolving
    bird cage.
Contains white, black, and gray plastic parts attached to sprues.
Other parts consist of an electric motor, belt guides, skinny belts,
    circular sheaves, rivets, a base, and motor holder.
Battery operated.
Small phillips screws for strong construction.
Structure of wheel is kept easy for maintenance purposes like
    replacing the belt, if needed.
Pulley turns easily, allowing a canine to wag his tail, an alligator
    to open his mouth, or a dolphin to "leap" into the water, among
    other selected motions.
Designed for relatively small and easy models.
Reverse rotation of wheel is possible.
Pictorial instructions included.

INCLUDES:
One Pulley-block System Set

REQUIRES:
Assembly
Battery
Small Phillips Screwdriver
Modeling Knife
Sprue Cutters
Long Nose Pliers

SPECIFICATIONS:
Base: Length: 4-3/4" (12.3cm)
Width: from 1/2" to 1" (1.5cm to 2.5cm)
Height: 1/4" (7mm)

REMARKS:
Keep out of reach of little kids. Includes small parts.
Instructions and box language composed in Japanese and English.