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cbr and udp packet size



Hi all,
In my script I have used a source CBR with a protocol of transport UDP.
 
    set udp1 [new Agent/UDP]
    $ns attach-agent $s1 $udp1
    set cbr_rt1 [new Application/Traffic/CBR]
    $cbr_rt1 attach-agent $udp1
    $udp1 set fid_ 2
    $cbr_rt1 set packetSize_ 120
    $cbr_rt1 set interval_ 0.00098823
    set null1 [new Agent/Null]
    $null1 set fid_ 2
    $ns attach-agent $r1 $null1
    $ns connect $udp1 $null1
 
Why the dimension of the packets transmitted  (in the trace-file) is 210 byte?
Beyond to the header (ip/udp) is there other?
 
Thanks Ivan