This is our smallest glass fish bowl and is well suited for mini table arrangements, floral centre pieces, terrariums and can be used as a candle-holder. Top opening is 8cmD, widest measurement 12cmD, height 9cm. NOT Suitable to be filled with water and used as a fish bowl. The holding volume of this small vase is 1.1L. Please note, as this is a handmade product, diameter of opening may vary.