Bowflex SelectTech 1090 Adjustable Dumbbell (Single) $179 + FS @ Amazon

[ctgolfer]

Adjustable dumbbell that does the work of multiple dumbbells in one
Weight adjusts from 10 pounds up to 90 pounds in 5-pound increments with the twist of a dial
Suitable for both basic toning and strength exercises and heavy leg lifts
Durable molding surrounds the metal plates to create smooth, quiet liftoff
Includes “Secrets of the 4-Step Rep” DVD with more than 30 exercises. Weight Settings (kg) : 4, 7, 9, 11, 13, 16, 18, 21, 23, 25, 27, 30, 32, 34, 36, 39, 41

https://www.amazon.com/Bowflex-SelectTech-Adjustable-Dumbbell-Single/dp/B00ODFCCJK?tag=phtwllt-20