The 4.3kg Lifebuoy series with all kinds of approvals is according to SOLAS.

4.3kg Lifebuoy

Outer Dia.(cm): 72

Inner Dia.(cm): 44

Thickness(cm): 10.5

Buoyancy(kg): >14.5

Weight(kg): ≥4.3

Color: Orange Crust Material: Low pressure polyethylene Inner Material: Hard PU

Approved according to CCS