The Fragraim Adjustable Ankle Weights in black are made of cotton and filled with sand, weighing 3 lbs each. Designed for strength training and therapy, these ankle weights are adjustable and suitable for both men and women. Perfect for gym workouts or running, these weights provide a customizable resistance level for a more personalized fitness experience. Made by the brand Fragraim in China, these ankle weights are a versatile and effective tool for improving mobility and muscle strength.