Offer letter is not having the details CTC breakups

So I have 4 years of experience and am doing a job switch. Now, the company where I got selected at sent me an offer letter which only had CTC amount and Bonus detail. But the breakup of that CTC is not provided. But I am asked to accept the letter first then I will be provided the breakup after a while. Is this normal? As I am concerned on anything unusual with the CTC breakup that might affect my in-hand salary.