This is a two piece propeller spinner. It's 3in in diameter and has a 5mm shaft hole. It's pretty light compared to commonly available molded plastic ones. I have on installed on a 32 size motor and have dozens of flights. No issues.
HK_Yak_54_Spinner_Base_v2.STL | 990.4KB | |
HK_Yak_54_Spinner_v1.STL | 2.3MB |