Review title is Perfect fit [SEP] These replacement heads were a perfect fit for my rechargeable Oral B toothbrush. The bristles are firm, but not hard, so brushing is thorough but not painful. They're also more resilient than the original brush heads which got bent out shape very quickly. By comparison, these hold up quite well. And the price for all 8 heads is quite reasonable.  There's no reason why I'll ever buy any other replacement heads as long as I can get these.