DESC: 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