Lead Bloons cannot be popped by sharp things. However, there are upgrades that change this (e.g. Flash Bomb, Juggernaut, Cleansing Foam, Red Hot 'Rangs, White Hot Spikes, etc.). Also, this is the only egg not to be a child of another. It contains 2 blacks meaning Bomb Towers should not be used alone to defeat leads(This excludes if the Bomb Towers are in the range to be affected by a Monkey Intelligence Bureau ).