Features:

With a strong manganese steel frame, two layers of tires, and an adjustable seat, this 18-inch wheel unicycle is ideal for both beginners and professionals to practice riding.
With an extra thick aluminum alloy rim and a strong manganese steel frame, this bike is built to last for long periods of time. The butyl inner tire provides leakage protection, and a 1 inflation lasts 100 days.
Easy storage and adjustable and detachable seat for users of different heights
A skid-proof tire and pedal prevent the bike from slipping. The seat has a plastic handle so beginners can grab on while riding.
The unicycle comes with a quick release seat post clamp and a wrench for easy assembly
Noiseless riding with mute bearings

Specifications:

The tire dimensions are 18" by 2 1/8" (45.72 by 5.4 cm).
The seat to pedal distance varies from 15 inches to 30 inches (38.1 centimeters to 76.2 centimeters)
The height of the unicycle can be adjusted from 30" to 34" (76.2 to 86.36 cm)
A user's height should be between 53 and 65 inches (134.62 cm and 165.1 cm).
132 lbs (59.87 kg) is the maximum weight allowed.
The net weight of the product is 8.6 pounds (3.9 kilograms)
28 steel spokes

Package Contents:

Frame for a unicycle
A single saddle for a unicycle
Wheel -  1
Pedals - 2
Wrench - 1
A manual is included