Soft Competition Springboared 5 SpringsTop and bottom board is multi layer composite wood elastic surface, covered with red carpet, equipped with 2cm thick high elastic sponge for better shock absorption effect. High temperature molded 2 cm multilayer birch wood bottom, with rubber anti slip pads. Inner tube is made of compressed sponge. 5 spring hard board with fall out device, increasing shock absorption effect. 40 80kg weight capacity. FIG approved