Grip Puppies Universal Grip Cover 5" (12.7cm)
A soft, squeezable grip that simply slips over your standard rubber grip (no need to remove standard grip) and leaves you with a soft, squeezable, tactile grip that will give greater comfort to any bike as well as reducing vibration through the grip. A significant benefit is greater throttle control by nature of a larger grip diamiter (especially on fly by wire throttles!)
Rock solid when fitted, a simple and very effective solution:-)
2 year International warranty (5 years in Europe & North America) against manufacturing faults or defects from the date of purchase. 
Warrantee does not cover removal and re-application or normal wear & tear.
Grip covers slip over your existing grips. Made of a special high tech material that is U.V. , ozone and oxidation resistant. Foam will not weaken or crack as a result of years of outdoor exposure. Wall thickness is approximately .15 inches (0.38cm).
Grip Puppies will fit OVER all standard grip sizes.
The standard Grip Puppy will fit standard bars sizes and grips. They are 5" (12.7cm) long and will fit grips that are 1.25 (3.17cm) to 1.45 (3.68cm) inches in diameter. (remember these fit OVER your standard grips, you don't need to remove them)
Grip Puppies can be trimmed to length with a craft knife or similar if needed (using appropriate care!)
These are great for adding a little extra thickness and comfort to your grips.
Will also work with heated grips.
Reduce vibration