SmallRig Silicone Gear 3852 is designed to provide a new, simple, and efficient follow focus experience. Working with the M0.8-43T, it can directly drive lens by friction independently.Designers: Victor Tang & Peiwen He Note: The driving force by friction is limited and not suitable forthe focus gear ring, for it may otherwise cause slip To avoid gear slippage, please ensure the silicone gear fits tightly with the lens ring, particularly for large-damping zoom lens. The silicone gear only supports SLR/ mirrorless lens. Just remove it before using a cinema lens. Compatible with standard M0.8-43T gear only Compatibility: Compatible with 3010 series follow focusIncompatible with gears of other module and tooth sizes In the Box: Silicone Gear x 1 Specifications:Product Dimensions: φ40 x 9.5 mmPackage Dimensions: 87 x 56.5 x 14mmProduct Weight: 4g ±5gPackage Weight: 9.4g ±5gMaterial(s): Silicone