Alfie Pet by Petoga Couture - Kerry Run-About Small Animal Exercise Ball for Small Animals like Dwarf Hamster and Mouse Ideal for hamster, mouse and other small furry animals. It measures 4.75" in diameter and 4.75" in height. Its entrance hole measures 2.75" in diameter. Fun exercise toy to maintain your pets alertness and agility. Relieves boredom and increases activity level and giving him a fun spot to play. Made with pet safe materials. Easy to clean and resistant to odors. Alfie is a registered trademark and is exclusively distributed by Petoga Couture. Alfie trademark is protected by US Trademark Law. Use is strictly prohibited. Other seller offerings are counterfeits, they will not be identical to what is advertised here. Petoga Couture ship from US thru Amazon therefore all orders with them are eligible for FREE Super Saver Shipping and Prime Shipping Upgrade.