How to measure
First, ensure that your microphone capsule is between 18-23mm in dimeter. Then, determine the length you need by measuring from the front-end of the capsule to the end of the grille (vents), and add about 1cm to that measurement to ensure a full seal.
Compatibility (including but not limited to)
Audio-Technica: AT 4073a (BP4073), AT 875 (AT875R), AT 877
Schoeps: CMIT 5U
Sennheiser: MKH 8060 + MZF + MZX + MZL
Sony: ECM 673, ECM 674, NEX-FS700RH, PXW-FS7/7K, PXW-X180, PMW-F5/55