Product Name Ferrite Core + Bobbin Model EI22 EI25 EI28 EI30 EI33 EI40 EI50 EI60 Material Iron, Plastic Color Dark Gray, Black Model: EI22 Frame: Vertical 4+4 Material: PC40 Needle pitch: five Row pitch: 12 Slot pitch: 8 Unit: one set (including one magnetic core and one skeleton) A: 22 B: 15 C: 6 D: 6 E: 10 F: 15 I: four Model: EI22 Frame: vertical 5+5 (spot row spacing: 10) Material: PC40 Unit: one set (including one magnetic core and one skeleton) A: 22 B: 15 C: 6 D: 6 E: 10 F: 15 I: 4 Model: EI25 Frame: Vertical 3+3 Material: PC40 Needle pitch: 6 Row pitch: 12 Slot pitch: 10 Unit: one set (including one magnetic core and one skeleton) A: 25 B: 18 C: 6 D: 6 E: 12 F: 15 I: 3 Model: EI25 Frame: Vertical 4+4 Material: PC40 Needle pitch: five Row pitch: 12 Slot pitch: 10 Unit: one set (including one magnetic core and one skeleton) A: 25 B: 18 C: 6 D: 6 E: 12 F: 15 I: 3 Model: EI25 Frame: Vertical 5+5 Material: PC40 Needle pitch: 5 Row pitch: 15 Slot pitch: 10 Unit: one set (including one magnetic core and one skeleton) A: 25 B: 18 C: 6 D: 6 E: 12 F: 15 I: 3 Model: EI28 Frame: Vertical 5+5 Material: PC40 Unit: one set (including one magnetic core and one skeleton) A: 28 B: 18 C: 7 D: 10 E: 12 F: 16 I: four Model: EI28 Frame: Vertical 6+6 Material: PC40 Needle pitch: 5 Row pitch: 17 Slot pitch: 10 Unit: one set (including one magnetic core and one skeleton) A: 28 B: 18 C: 7 D: 10 E: 12 F: 16 I: four Model: EI28 Frame: Vertical 9+9 Material: PC40 Needle pitch: 4 Row pitch: 17 Slot pitch: 10 Unit: one set (including one magnetic core and one skeleton) A: 28 B: 18 C: 7 D: 10 E: 12 F: 16 I: four Model: EI30 Frame: Vertical 5+5 Material: PC40 Needle pitch: 5 Row pitch: 17 Slot pitch: 13 Unit: one set (including one magnetic core and one skeleton) A: 30 B: 20 C: 10 D: 10 E: sixteen F: 21 I: five Model: EI30 Frame: Vertical 6+6 Material: PC40 Needle pitch: five Row pitch: 20 Slot pitch: 13 Unit: one set (including one magnetic core and one skeleton) A: 30 B: 20 C: 10 D: 10 E: 16 F: 21 I: five Model: EI33 Frame: vertical 6+6, vertical 7+7 Material: PC40 Vertical 6+6 stitch pitch: five row pitch: 22 slot pitch: 16 Vertical 7+7 sew pitch: 5 row pitch: 22 slot pitch: 16 Unit: one set (including one magnetic core and one skeleton) A: 33 B: 23 C: nine D: 12 E: 19 F: 24 I: five Model: EI33 Frame: Vertical 9+9 Material: PC40 Needle pitch: five Row pitch: 23 Slot pitch: 16 Unit: one set (including one magnetic core and one skeleton) A: 33 B: 23 C: nine D: 12 E: 19 F: 24 I: 5 Model: EI40 Frame: Vertical 6+6 Material: PC40 Needle pitch: 5 Row pitch: 22 Slot pitch: 17 Unit: one set (including one magnetic core and one skeleton) A: forty B: 28 C: 11 D: eleven E: 20 F: 27 I: 6 Model: EI50 Frame: Vertical 6+6 Material: PC40 Needle pitch: 7 Row pitch: 27 Slot pitch: 21 Unit: one set (including one magnetic core and one skeleton) A: 50 B: 35 C: 14 D: 14 E: 24 F: 33 I: 9 Model: EI60 Frame: Vertical 6+6 Material: PC40 Needle pitch: 7 Row pitch: 34 Slot pitch: 23 Unit: one set (including one magnetic core and one skeleton) A: 60 B: 43 C: 15 D: 15 E: 27 F: 36 I: 8 Model: EI25 Frame: Horizontal 4+4 Material: PC40 Needle pitch: four Row pitch: 15 Slot pitch: 11 Unit: one set (including one magnetic core and one skeleton) A: 25 B: 18 C: 6 D: 6 E: 12 F: 15 I: 3 Model: EI30 Frame: Horizontal 5+5 Material: PC40 Needle pitch: 5 Row pitch: 18 Slot pitch: thirteen Unit: one set (including one magnetic core and one skeleton) A: 30 B: 20 C: 10 D: 10 E: sixteen F: 21 I: five Model: EI40 Frame: Horizontal 7+7 Material: PC40 Needle pitch: five Row pitch: 25 Slot pitch: 18 Unit: one set (including one magnetic core and one skeleton) A: 40 B: 28 C: eleven D: eleven E: 20 F: 27 I: 6