good quality tempered ND glass. The filter could be a bit tighter when installed on Insta360 4K MOD lens because in case of a crash the filter could go out easily.

good quality tempered ND glass. The filter could be a bit tighter when installed on Insta360 4K MOD lens because in case of a crash the filter could go out easily.

good quality tempered ND glass. The filter could be a bit tighter when installed on Insta360 4K MOD lens because in case of a crash the filter could go out easily.

These look great. I wish they came with a smaller / better case but the filters themselves are good.

These look great. I wish they came with a smaller / better case but the filters themselves are good.

These look great. I wish they came with a smaller / better case but the filters themselves are good.