Pirastro Obligato Double Bass 4/4-3/4

These are top quality bass strings with synthetic core and metal winding. If you like the slightly softer feel of a synthetic cored string these are a good option. They have a full round sound and feel nice under the fingers.
I have fitted them on quite a few instruments and never had any complaints -they are certainly well made and seem long lasting. They are definitely better than cheaper synthetic cored strings that I hace tried.
They are great as a general purpose string for covering a range of styles. If however you play exclusively in one style (classical/arco or slap for example) you can probably find something more suitable. Strings are very much a matter of personal taste/what suits a particular instrument/playing style etc. so there are no hard and fast rules... whatever works for you! Definitely worth a try if you think they might be what you are after.