One hot products that never looses its value is vape pens for cartridges. Cartridge or tank is commonly what the top piece is referred as. Mostly we have people who have their medical card and are looking to vape THC or don't have their card and look for a device to vape CBD oil. We have an entire case in our store dedicated for these products. All most products have temperature settings weather you adjust it by clicking the button a certain amount of times or we have devices that have digital screens so you can see your battery and adjust the temperature easier. Slim designs for most and most products will last day and night and can still hold a charge. Also some products will be able to take any size cartridge.