1. Stainless steel + aluminum alloy material, durable and not easy to deform 2. Retractable spring design, suitable for different board thicknesses (within 4.5cm) 3. Small and convenient, does not occupy space, and is firmly fixed 4. Aluminum alloy rope buckle, firm and thin, smooth and comfortable to handle 5. Material: stainless steel, aluminum alloy 6. Size: about 7.5 x 3.5 cm/piece 7. Weight: about 16g/piece
