Brass cages with the following characteristics: – continuously or centrifugally cast, – turned, – containing by weight 35 % or more, but not more than 38 % of zinc, – containing by weight 0,75 % or more, but not more than 1,25 % of lead, – containing by weight 1,0 % or more, but not more than 1,4 % of aluminium, and – with a tensile strength of 415 Pa or more, of a kind used for the manufacture of ball bearings