This NeuroQuinti Five-in-One has a Buck-type reflex hammer, with a C128hz Tuning Fork (also available with C-256Hz ) built in. The fork is hand tuned, weighted and has rounded ends to protect your hands and your medical bag. There is also a neuro-pinwheel, a brush, and a pin in one convenient instrument. Aluminum alloy cannot rust. The C-128 weighted fork is used for vibration testing only, it is 25 cm in length, weighs 141.7 gm.