Yellow Silica Gel, 1 Pound (1lb 2oz), Yellow/Orange, Indicates as Green, Turns Green When it Needs to be Replaced or Reactivated, for Commerical or Personal Applications, Reuseable, 1lb

Pretty easy to work with and the indicator color change is strong and pretty speedy. The ironic thing is that they're very excited about how it's packaged in the USA, but while the beads are fine, the bag is pretty crappy. Took all of five minutes to tear!