This is our new colorful 510 delrin drip tip, working for all 510 tanks. Such as Artery PAL II Pro, Artery PAL 2 Pro, Reload MTL RTA, Millennium RTA...... Cheap price with free shipping, USA customers will receive package from our USA warehouse now, USPS shipping will arrive in about 3-10 days. Other countries can also get in about 7-15 days. Check below to see more details.