“RTX ZipCore relocates mass with a low-density core to push MOI and CG higher, paired with UltiZip grooves. Low grind (6-degree C sole), Mid (10-degree V), and Full options cover most players. A top players/tour milled used buy.”

The RTX ZipCore (2020) made the biggest construction change in the RTX line's history: a low-density core buried inside the head that let Cleveland move real mass to the toe and up the face, raising MOI and repositioning the CG without changing the compact tour shape. Cleveland measured about 9% higher resistance to twisting on high/low impacts versus the RTX 4. It debuted UltiZip grooves, the sharpest, deepest, and most tightly packed grooves Cleveland had made, roughly 11% sharper, 7.3% deeper, and 7.4% closer together for more spin in rough and wet. Reviewers ranked it among 2020's highest-spinning and best-feeling wedges. Grinds were Low (6-degree C sole), Mid (10-degree V), and Full. It retailed at $149 and was replaced by the RTX 6 ZipCore.

Notable for a genuine technology debut, not for scarcity: ZipCore's low-density-core construction and UltiZip grooves were a real, widely covered engineering step that carried into every RTX and CBX generation since, and multiple independent reviews named it among 2020's best-feeling/highest-spinning wedges. That is a documented innovation and reception story; used prices remain ordinary, so it is 'notable,' not cult.

For mid-to-low handicaps who want tour-milled spin and feel with a small, genuine MOI cushion, and who can pick a grind (Low C-sole for open-face/firm turf, Mid V for all-around, Full for square-faced/steeper players). Not a forgiveness club for the golfer who chunks and blades; that player belongs on the CBX or Smart Sole.

• First RTX wedge built around a low-density ZipCore that relocated mass to the toe and up the face; about 9% higher MOI on high/low impacts than the RTX 4.
• Debuted UltiZip grooves: roughly 11% sharper, 7.3% deeper, and 7.4% more tightly spaced than the prior generation.
• Grinds were Low (6-degree C sole), Mid (10-degree V sole), and Full; lofts 46-62 degrees.
• Retailed at $149 per wedge, the priciest RTX to that point.
• Widely rated among the highest-spinning and best-feeling wedges of 2020 in independent reviews.
• Also sold in a Tour Rack raw (unplated) version favored for added spin as the raw face rusts.

Launched 2020 against Titleist Vokey SM8 and TaylorMade Milled Grind 2/3, again as the spin-and-value pick but now with a real tech differentiator. It replaced the RTX 4 and was replaced by the RTX 6 ZipCore (2023), which added far more ZipCore material and HydraZip face blasting. A modern equivalent is the RTX 6 ZipCore or the later RTZ line.

Private-party 2026 value is roughly $55-$85 for a clean single wedge, holding a bit better than pre-ZipCore RTX models thanks to its still-relevant tech and strong reputation; raw/Tour Rack and Black Satin examples run higher. Reconditioned-retail grades sit above private-seller reality. Groove wear remains the dominant depreciator.