Yeah... 3meter long , 1.3 meter wide and 1.5 tons in weight. Thats the size of Agni-5 nuke. Unlike USA's just 150-350 Kilos, and Pakistan's 500-700 Kilos.
Thats why India needs larger missiles to throw their big and heavy nukes to shorter distances.
In future, Agni-V is expected to feature MIRVs with each missile being capable of carrying 2–10 separate nuclear warheads. MIRVs ensure a credible second strike capability even with few missiles. According to DRDO sources,an MIRV payload would be significantly heavier, since it would consist of several nuclear warheads, each of them weighting about 400 kilogrammes. A 5-warhead MIRV, therefore, would weigh two tonnes.