These are extra-thick sticks with a diameter of 33mm. They can be used on everything from thick skins like congas and bongos to metal instruments such as cowbells, and even large skins like bass drums.
These are ultra-thick drumsticks with a diameter of φ33. They are widely applicable, from thick-skinned instruments such as congas and bongos, to metal instruments such as cowbells, and even large drumheads such as bass drums.