... ROHS, FDA, NSF, WRAS, etc. Details of silicon rubber seals for glass bottle:1. Materials: comply to ROHS, Silicone (VMQ), or NBR ... A or as your requested. 4. Tolerance: strictly upon international standard, no flash.5. Color: black, transparent, green, red, yellow, ... shippment.5. Lead time: 1-2 weeks for production mold, and 25 days for complicated injection mold. Capability of our rubber workshop ...