A shooting and training aid for basketball players to prevent interference of the non-shooting hand when shooting a basketball. It yields sufficient exchange coupling energy even in smaller thickness of the antiferromagnetic layer than before, whereby it becomes feasible to decrease the thickness of the exchange-coupled film. in percutaneous aspiration biopsy, includes an outer needle and a sample-receiving device for receiving a severed tissue sample, the sample-receiving device being movable in the hollow needle.