The 21st Century Smoke’s rechargeable e-cigarettes are available with convenient, self-contained atomizer cartridges. The Express Kits feature one rechargeable battery, two cartridges and a 110 AC wallcharger. The Super Kits have two batteries, six cartridges and a 110 AC wallcharger. Disposables are 100 MM long and smaller diameter. The kits include easy-to-follow instructions.