Brand Name: WASIG Origin: Mainland China Hign-concerned Chemical: None Material: copper with silicone lined Size: 4.5*3.3*6.0MM Item Type: Links, Rings & Tubes Quantity: 500 pcs Model Number: 4.5*3.3*6.0mm1 is_customized: Yes Color: 1# black Size: 4.5*3.3 Material:: silicone+copper Size:: 4.5*3.3*6.0mm(Outter*Inner*Length)