Specifications: (1 piece is included in the package) Product:IR Cut Filter Glass Application:BMCC 2.5K BMPC 4K Blackmagic Cinema Camera (EF mount) If your camera is with MFT(M43) mount,please leave message to me.It use another size. About Quality Guarantee: Blue glass filter always have striaes and bubbles inside. We select every filter carefully to guarantee that it is free of any defects. Find us: Shijiazhuang Tangsinuo Optoelectronic Technology Co.,Ltd.