We know how much birds love to go for the Metal Tabs on soda/pop cans. Here is a safe alternative in plastic. They measure 1-1/16" in length and are just shy of 3/4" wide and are 1/16" thin. They have 3 different holes the measurements are from top to bottom starting with the round hole. They measure 1/8", 3/8" x 1/4" and the last hole measures 3/8" x 3/16". They come in an assortment of neon colors including Pink, Orange, Yellow, Green, Blue and Purple.