The sram pg 1050 10 speed cassette offers an innovative approach to 10 speed cassette design srams cassette performance is optimized by material choice tooth profile and shift ramp design for a quick and positive index shifting the cassette shifts efficiently and positively in all high performance situations the new cassette features a semi spidered construction for a maximum stiffness to weight ratio and is available in many optimized configurations to best match a wide variety of uses