Wobust Wodent Wheel theratshop.com - $17.00 Product Description: Wodent Wheels are one of the safest wheels on the market! Strongly endorsed by rat slaves, the Wodent Wheel is the only exercise wheel recommended and approved by the ASPCA. Wobust Wodent Wheel. 12" diameter, 5.3" wide, 3.6" "mouse-hole shaped" entry holes. Overall height 13". RattyRat's Review: Hands down, this is the safest wheel on the market that you can buy. If you plan on providing an exercise wheel for your rat, we recommend this one. Specifically the Wobust Wheel because rats like their wheel to be as big as possible, so even if you have girls get this size. It is durable, quiet, and easily comes apart to be cleaned. What ever wheel you do end up buying for your rats, stay away from the kinds with the bar that goes across the open sides of the wheel. These bars can cause some nasty injuries by catching your rat's tail within the wheel as it spins. Warning, not all rats will use a wheel. So don't be discouraged if they don't hop right in and start running. Rats are not hamsters. Younger aged rats are the most likely to use a wheel. Some rats might not realize how to use it. You can teach them by placing tiny smears of a pasty type food along the course of the inside of the wheel and as your rat moves along to lick each tasty spot they will discover how the wheel works. You may have to repeat this procedure more than once. If you have a wheel that squeaks (although ours never has), you can use vegetable oil to lubricate the metal on metal parts of the wheel. Commercial lubricants are not safe to use because of their toxicity. How To Mount a Wodent Wheel on to Your Rat's Cage Step One: Take the pin out and remove the wheel from the base. Step Two: Thread the base of the wheel through the bars into the cage. Step Three: Use zip ties to attach the base to the cage. Step Four: This is how the base should look completely attached. (Be sure to cut the extra zip tie plastic off for a cleaner look.) Step Five: Attach the wheel back onto the base and there you have your mounted wheel.