Oxloc, Mauer, Dom, are several of the brands I work with. They vary in price but are tested and get stars. Three stars cylinders can be used without a core pull batter. Two stars cylinders need to have core pull batter

You have three star cylinders with a certificate such as:

Oxloc:   08 (Foto)

Mauer: Dt1 of Dt1+ the latest with a bridge reinforcement

Dom:    IX Twin star with bridge reinforcement

You have also three stars cylinders without certificate

Oxloc:    07

Mauer:  F3

Dom:     Plura