This kit includes a base, top ring, a shrimp net and instructions. You'll notice 2 air lines. One is for the air pump to the bubbler in the base and the second is for draining off the baby brine shrimp (after shutting off the air). The top ring stabilizes the 2 liter bottle and holds the air lines above water level. The shrimp net uses coffee filter material as netting, change as needed. The kit does NOT include the 2 liter bottle and the air lines.