This is a Pulley Unit Set for Various Models.
It's from Tamiya for very experienced model builders.
FEATURES: Pulley set is designed to attach to a chosen model kit such as a
jumping dophin, an elevator, a moving dog, alligator, or revolving
Contains white, black, and gray plastic parts attached to sprues.
Other parts include an electric motor, belt guides, skinny belts,
circular pulleys, rivets, a base, and motor holder.
Small phillips screws for solid construction.
Structure of pulley is kept simple for maintenance purposes like
replacing the belt, if needed.
Pulley rotates freely, allowing a dog to wag his tail, an alligator
to open his mouth, or a dolphin to "jump" into the water, among
other chosen motions.
Designed for fairly small and simple models.
Reverse rotation of pulley is possible.
Pictorial instructions included.
INCLUDES: One Pulley Unit Set
Small Phillips Screwdriver
Long Nose Pliers
SPECS: Base: Length: 4-3/4" (12.3cm)
Width: from 1/2" to 1" (1.5cm to 2.5cm)
Height: 1/4" (7mm)
COMMENTS: Keep out of reach of small children. Contains small parts.
Instructions and box language written in Japanese and English.