Bare Bones: 4 airstones, 3/8" to 1/4" quick connect adapter, 20 ft. 1/4" high pressure compatible tubing, 6x T connectors, 2x elbows

Basic: 8 airstones, 3/8" to 1/4" quick connect adapter, 40 ft. 1/4" high pressure compatible tubing, 10x T connectors, 6x elbows, 2x bulkhead unions

Advanced:  12 airstones, 3/8" to 1/4" quick connect adapter, 60 ft. 1/4" high pressure compatible tubing, 14x T connectors, 10x elbows, 6x bulkhead unions, multi-step titanium drill bit, 12 pre-drilled silicone stoppers