It is named "Bi-Metal Heatbreak" It has two components with different thermal conductivity. It is composed of 2 parts. We use a special process to hold them firmly together. You don't need to worry about it being damaged. NOTE: This Heatbreak is only used for Dragonfly BMS and BMO hotend Packge: 1 piece Bi-metal heatbreak The Heatbreak is designed and manufactured by our partner (PHAETUS) for BMS and BMO hotend use. This one is not suitable for other hotend, please know before ordering.