3MM/4MM/5MM/6MM/7MM/8MM Square Shape Centre-hole Metal - Etsy
Amazon.com: Chanzon 100pcs (10 colors x 10pcs) 5mm LED Diode Lights Assortment (Clear Transparent Lens) H&PC-59042 Emitting Lighting Bulb Lamp Assorted Kit Variety Color White Red Yellow Green Blue Orange UV Pink :
Diffused RGB 5mm LED (25 pack) : ID 302 : $12.50 : Adafruit Industries, Unique & fun DIY electronics and kits
AIM at Melanoma - The difference between 1mm, 2mm, and 5mm is very small but these differences make big differences in staging of melanoma. Learn about staging of melanoma at: https://goo.gl/hSdj0u