With sustainable development concerns increasing, pervious concrete is gathering more and more attention for its ability to naturally reduce runoff, clean stormwater, replenish groundwater and protect streams. And, since a demonstration is worth a thousand words, these 4" diameter x 1.75" thick pervious pucks will help you show how tough, sturdy pervious concrete drains when it rains. Keep on one your desk and take one on every sales call, to trade events and anywhere where this remarkable product is bound to attract attention (This discounted bulk rate includes shipping cost).