The card artwork depicts a Double Lead Bloon punching a blue punching bag with a drawing of a happy Monkey's face taped onto it. The chain for the punching bag snapped after the impact of the Double Lead Bloon's left Bloon. In the background is an empty boxing ring and the interior of a gym.
Compared to most Double Bloons, Double Leads are less susceptible to low-hit damage, which makes Barrel of Monkeys or other low damage Monkeys struggle. However, they're slower than Double Yellows for the same cost, so its strength mostly relies on its large Armor.
Unlike Double Yellows, Double Leads can take two Long Range Rangs without getting destroyed, leaving 40 Health outside of Dark Castle or other Health modifiers.
Try to use high-damage attacks on Double Leads first. Storm Of Arrows and Super Monkey Storm do significant damage but cannot one-shot them.
While they are slower than Double Yellow Bloons, and do not have a higher health pool than the 2 Gold more expensive Double Ceramic Bloon (which poses more of a direct threat), Double Lead Bloons are notably unable to be damaged by Barrel of Monkeys without ATK bonuses and resistant enough against Robo Monkey. Note that players do equip high-damage or Armor Piercing Monkeys.
There are two Lead Bloons on this because it's a double Lead, so why not double the armor? And a health boost to also help with that. This generally makes Double Lead a lot easier to actually hit and deal damage with, and it makes it less of the laughingstock out of the doubles. — u/No-Appearance1780's commentary, 17:49–18:03 (with most disfluencies removed)
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Health increased ― 130 → 140
Armor increased ― 10 → 20
Development
Ninja Kiwi proposed a buff to Double Lead Bloon in Version 5.2 by increasing its Health from 100 to 130, which was left unchanged for the update.
Version 6.4 further buffed Double Lead Bloon, with the incentive of being more tanky against chip damage, alongside a thematic fit with being a "double" Bloon.[1]
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Trivia
This card's flavor text is a play on words: "Pb" is both an abbreviation of "personal best" and the chemical symbol of lead.