Air Circulating Ring

Magnum's air circulating ring is no ordinary ball cup. Its patented design minimizes the chances of cracking when older, more brittle reactive resin bowling balls are stored on a cold surface such a basement or garage floor. Older reactive-resin coverstocks dry and shrink over time creating increased surface tension making them prone to cracking from thermal shock.

Here's how it works:

Standard ball cups create a cold air column directly connecting the concrete floor's temperature up to the ball. This creates what is called polar temperature differential. This is where the bottom portion of the ball is colder than the warmer top portion of the ball's coverstock where warmer ambient air is circulating.

We know that an older ball's porous and brittle coverstock already has existing surface tension and is at risk for spontaneous cracking. Add in different temperatures affecting the ball at the same time and the coverstock can't tolerate the different rates of expansion and contraction. This greatly increases the chances of igniting circumferential cracking.

Magnum's patented design allows for the air to flow beneath the ball while keeping it off the floor surface. This reduces temperature differential described above. When the patented air circulating ring's design is combined with the insulating properties of the Immortalizer, the coverstock has sufficient time to equalize its temperature from top to bottom. The result greatly reduces the chances of cracking due to thermal shock.