DTR Gripper
A gripper is what holds the skin onto the DTR bell.
There made from medical grade silicone and last a very long time.

There are two versions of grippers, one with holes and one without.
They can both be used by themselves or together when using different methods with the DTR.
The grip works by friction. Simply put when the skin is rolled onto the bell and the gripper  rolled onto the skin. The skin becomes held by both the bell and the gripper, when force is used such as tugging or dual tension the skin gets pulled as if it is being pulled off the bell, When this happens the gripper gets tighter since it clings to the skins surface and tries to moves with the skin. Since the gripper is tapered like the bell the gripper can not slide off the bell with the skin. This action holds the skin tighter to the bell. The more tension the more grip.
For more information on how a gripper is made click here.
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Gripper removal is easy, first invert the gripper so that it's flipped inside out just as you would if you are about to attach the gripper to your skin.
Just pull on the gripper and work it over the collar portion of the DTR Bell.
Continue to work the gripper by stretching it over the collar
And finally work the gripper over the nylon screws ( if they are being used ) grippers will stretch quite a bit and it's pretty difficult to rip one.
To reinstall the gripper just reversed the process.