This is my mtl driptip, a 510 driptip, small and short. Very robust. Tested and fully working. Perfect sized for 510 MTL atomizers. Max sizes of driptip is 9mmx22mm: more detailed size in the images. It is my everyday first choice for my syren2 atomizer and other small e-cig setups. You can use 2 standard 510 O-ring. I would recomend to print that driptip up-down. It is very robust and resistant. I hope you like it and would love to get your feedbacks! Good Vaping!