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I would buy at least 14 cans to get the free shipping over $49 spend and bulk buy ($3.70/can discount). If you buy fewer than 4 balls then the unit price won't be $3.70/can. You can get free shipping with fewer balls if you pick up something else from the Wilson eBay store, so long as it adds up to $49 or more.
Probably compatible with the PASTA5 coupon if you want to buy MOAR TENNIS BALLS
It is $51.80 (promo automatically applies)
Competition level ball, ITF approved.
Strayfire Ball Review:
Wilson Tour Premier Grass (White)
Type: Hard
Felt: Compact
Weight: Average.
Bounce: Higher than average. Good bounce retention.
Shots: Feels firm as the ball is more pressured than regular tennis balls. This gives it a fair amount of pop through the air. The downside is if you have tennis elbow it could be quite painful.
Durability: Lettering seems smear. The green text rubs off quite easily when exposed to water. However, the ball itself is very durable. The ball seems to resist taking on water better than most tennis balls with an impressive hydrophobic coating. As this wears down from play it absorbs more water, but still better than the hydrophobic coating of the average ball. Notably, like many grass court balls, it fluffs up on hard court which reduces the speed of the ball as you play with it.
Misc: The ball itself is high quality but harder to see. Wilson markets this ball as being identical in specs to the Wilson AO ball that existed prior to 2018. However, on all occasions that I have tried to bring it out, players and parents have complained about the white colour of the ball. Despite the ITF approval and status as a legal competition class tennis ball, many people reject it because of its colour. Many do not know that Wimbledon was played with a white ball until 1984 and white was the only colour of ball available prior to the 1970s.
Other Testers: Pusher thought the ball was easier to hit lobs with because of the higher bounce.
Verdict: Mixed. I got this ball at firesale prices because Wilson is having issues selling the ball. If your friends are okay playing with a white ball or you need something for Rover, this is a good ball at a good price. Be aware that this is harder to see than regular yellow tennis balls.
Purchased these last time. Bounce and longevity was fine but visually it was getting harder to see or at least focus on compared to the typical fluro yellow balls