This is a new, sealed in original packaging, MR33 (MR3) brand MR33 Tungsten Weight - 21 x 21 x 1.5mm - 12g . Its part number is 3-TW-12G
WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov