Material: Silicone Size: Standard size: 8cm*7.8cm*2.2cm/3.15in*3.07in*0.86in, Large size: 8.4cm*8.1cm*2.3cm/3.30in*3.18in*0.90in. Color: As shown in the figure Product features: 1. Multi-functional design: Suitable for hand grip training of 20-90 pounds/30-60 kilograms, can help strengthen arm, wrist, and finger strength. 2. Quality guarantee: Made of high-quality silicone material, It is not easily deformed, even after long-term use. 3. Lightweight and portable: Compact and portable design, convenient for strength training anytime and anywhere, whether at home or in the gym. 4. Comfortable massage: The surface of the hand grip exerciser is textured to help massage hand muscles, relieve fatigue, and improve blood circulation. 5. Three levels of resistance: Octagon design, with three different resistance levels, allowing individuals to choose the appropriate hand grip exerciser based on their own needs, meeting different training requirements. Package includes: 1 pc Silicone Grip Strengthener