Masterbuilt 20070112 Cold Smoking Kit for Masterbuilt Digital Smokers Fits all Masterbuilt Digital Electric Smokers Continuous feed wood chip system provides up to 6 hours of constant and consistent smoke Uses regular wood chips. Black powder-coat body and door with CSA Certified Excellent for smoking and curing foods They are COLD KITS- which is a chip feeding/heating system that ATTACHES to a digital smoker.