• Plastic, sponge
• Balance tool:this fin box sup fin box can the stability of fin box to keep safety of you when surfing
• This fin box can increase the stability of the sup and keep you safe while surfing
• With the repairing design, easy to install and use, can meet your various needs
• The fin box appearance design, so that more in line with the principle of for water sports, with better for water and mobility
• Made of plastic and sponge material, tough, wear-resistant, durable suitable for various kinds of fin