1

Customization cases of piston ring products in the past 5 years:

2019:

63 models were designed and developed independently,

46 models were customized with drawing and samples;

2020:

51 models were designed and developed independently,

57 models were customized with drawing and samples;

2021:

58 models were designed and developed independently,

49 models were customized with drawing and samples;

2022:

77 models were designed and developed independently,

42 models were customized with drawing and samples;

From 2023 to now:

16 models were designed and developed independently, 20 models were customized with drawing and samples;

2

Customization range:

Cylinder Bore Diameter: 16.5mm – 150mm

Surface Treatment: N, PVD, DLC

3

Customization process:

Independent design & development process:

According to the boundary conditions of the engine design and customer requirements ---- make a scheme ----negotiate and confirm the scheme with customer ---- business negotiation ---- make a development & delivery plan ----submit drawing ---- drawing approval by customer ---- make sample ---- delivery of sample ---- sample order complete ---- accept customer bulk order ---- delivery of bulk product ---- order complete

Customization with drawing or samples process:

Technical review on drawing or samples ---- report to customer (communicate with customer if there is any change or suggestion) ---- confirm the technical scheme ---- business negotiation ---- make a development & delivery plan ---- production drawing confirmation ---- accept customer order ---- make products ---- delivery of order ---- order complete