I can't find rounds for this bass. Help!!
Thanks for your help...
If you want them to be "acoustic" ( = bronze-wound; they're marginally louder unplugged, when fresh, than nickel/nickel-plated steel/stainless steel),
Fender 7060 set: medium scale, 045-065-080-100
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Ibanez IABS4C32 and
IABS4XC32 sets are also medium-scale (and micro-coated, hence longer-lasting), but lighter-gauge at 40-60-75-95
Medium-scale ( = built for 32" scale instruments) means that, on your 30" GMB101 acoustic bass guitar, the low E will be wound at full gauge onto its tuning post, which might (or might not) cause its breakage, unless you thread it into a 1/2-inch metal tube (something like a Telecaster guitar thru-body ferrule) before installing it, so that the ball is distanced from the back of the bridge, and the string tapers ahead of the post at the other end. Or just rawdog it.
I use and recommend
Savarez 4CB640R strings:
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Also designed for medium-scale, but they actually don't taper because they're single-wrap; breakage is anyway not an issue (unless you remove and reinstall them frequently) because they're nylon-core and very flexible. The winding is not bronze but silver-plated copper: in practice they're giant classical-guitar wound strings.
The
La Bella CB40BE are similar but lighter-gauged:
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If you're fine with "electric" (nickel or steel-wound) strings, hit an online store (FretNation, StringsbyMail, StringsandBeyond, JustStrings, GimmesomeStrings, StringThis), website-search for "short scale bass" and ignore flatwounds and tapewounds: save from outliers (Curt Mangan and Thomastik-Infeld, whose "short-scale" sets are really medium-scale), all results would fit fine on your instrument, with no need for tube spacer trickeries.