Mammoth 98874 In-Ground Basketball System with 72-Inch Backboard Durable in-ground basketball goal designed for rugged, high-intensity play 72-inch tempered-glass backboard with steel frame and foam frame pad Rapid Cam mechanism raises or lowers rim from 7-1/2 to 10 feet in infinite increments Spring Flex rim with double-compression springs for dunking; all-weather nylon net 30-inch extension arms for durability; anchoring system with anti-flex design; lifetime warranty