This is High Quality photodiode BPW34. Material: Metal Size: 3 * 3 mm Package Included:5Pcs BPW34 Silicon PIN Photodiode DIP-2(If the number of products received is incorrect, please contact us . we will refund or give you a replacement). We highly appreciate all customers opinions to improve the selling, also if anything you unsatisfied, please contact us for probable best solution.