Is this CDr single still considered a rare item?

Yes, as it is a 2019 release on a specialized label, it holds collectible value for Pop music fans.

What format is the Summer Rocket single in?

The Summer Rocket single is available in the CDr format.

This release was put out by Endless Summer Records in 2019.

Name: Summer Rocket – ネバーエンディングサマー Ver.2/プールサイドのイルカ (CDr, Single)
Brand: Summer Rocket

Pop

What ネバーエンディングサマー Ver.2/プールサイドのイルカ by Summer Rocket is worth on the used market.

Label · Endless Summer RecordsFormat · CDr, SingleGenre · Pop

Used

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New / Sealed

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ネバーエンディングサマー Ver.2/プールサイドのイルカ by Summer Rocket (2019) on CDr, Single. The Discogs marketplace floor is null with 0 copies currently for sale.

Pressing, country, and condition (media + sleeve) move vinyl/CD values the most — first pressings and clean copies command a premium.

Is this CDr single still considered a rare item?: Yes, as it is a 2019 release on a specialized label, it holds collectible value for Pop music fans.
What format is the Summer Rocket single in?: The Summer Rocket single is available in the CDr format.
Who released this "Summer Rocket – ネバーエンディングサマー Ver.2"?: This release was put out by Endless Summer Records in 2019.