Small and flexible to be held with one hand, but large enough to be held with both hands. Their soft, flexible vinyl case makes them comfortable and safe to hold. They are a safe and effective way to add weight to your daily exercise. They are available inflated and ready to use. If extra volume is needed, pressure can be added via a needle pump. Available in 6 weights: 0.5kg (beige), 1kg (yellow), 1.5kg (red), 2kg (green), 3kg (black). With color code for their weights.