Name: Silicone Rubber Snap-on Grommet Material: Silicone Rubber Color: black Size:complete specifications, please choose from the list. For example, 4.5mm(Hole2mm), suggests that A=4.5mm, E= 2mm hole. Ohter sizes, please talk to the dimensions chart. Temperature: -40°C-250°C Hardness: Shore 50 Product performance: Silicone rubber is a tender and elastic materials with nice sealing type, high temperature resistance, anti-aging, acid and alkali corrosion resistance. Package Included: 1/2/5pcs * According to your choice. Warm tips:1. There is probably 0-0.3mm error in the manual measurement, please take it into consideration, thank you!2. The actual shade of the object might be slightly assorted from the images due to the digital camera and light effect.