Bal slam digawe saka karet kandel, diisi pasir, lan duwe katup udara sing ngeculake tekanan kanggo nyegah bledosan. Padha dimaksudake kanggo dibanting ewonan kaping tanpa rusak lan umume duwe rasa alus lan owah-owahan. Bola obat biasane digawe kanthi tangan nggunakake jahitan lan macem-macem cangkang njaba, kayata kulit utawa bahan sintetis. Padha dirancang kanggo latihan gerakan dinamis, kayata mbuwang, ora mbanting.
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