Variants of a mold are catalogued separately, so each one has its own sets and minifigs. Check these too if something you expect is missing here.

• 2584c02 String Reel 2 x 2 Complete with String this part is a sub-part of it
• 2584c03 String Reel 2 x 2 Complete with String and Dark Gray Grappling Hook this part is a sub-part of it
• 2584c04 String Reel 2 x 2 with String and Dark Gray Hook with Towball [Complete Assembly] this part is a sub-part of it
• 2584c06 String Reel 2 x 2 with String and Red Slider Hook [Complete Assembly] this part is a sub-part of it
• 2584c07 String Reel 2 x 2 with String and Dark Bluish Gray Grappling Hook [Complete Assembly] this part is a sub-part of it
• 2584c08 String Reel 2 x 2 Complete with String and Dark Bluish Gray Hook with Towball this part is a sub-part of it
• 14728 String Cord Medium Thickness [Undetermined Length] Mold of this part
• 56823 String Cord Thin (0.5mm) [Undetermined Length] Mold of this part
• 75775 String Cord Thick Mold of this part