The Kenda Inner Tube 16" x 1.50/1.75 FV is a common inner tube size for kids' bikes and smaller adult bikes like folding bikes.

Key features:

• Size: This tube fits 16-inch wheels with tire widths ranging from 1.50 to 1.75 inches. This is a very common size for children's bikes, so it's a good option if your child needs a replacement tube.
• Valve: It uses a Presta valve (FV). As mentioned before, Presta valves are known for being more lightweight and better at holding air compared to Schrader valves. This is a nice feature even for a kid's bike, as it means you won't have to re-inflate the tires as often.
• Durability: Kenda makes decent quality inner tubes, and this one should hold up well to regular use. However, kids can be tough on bikes, so it's always a good idea to have a spare tube on hand just in case!