According to Singapore government, all the items imported to Singapore may be subject to a 8% Goods & Service Tax (GST).
However, according to Singapore government's guide, currently, you do not have to pay GST when purchasing at FASBEE. Nonetheless, if the package's value exceeds $400 SGD, Singapore Customs will charge customers GST when the goods arrive in Singapore.
Please refer to following pages of Singapore Revenue Authority and Singapore Customs for more details:
https://www.customs.gov.sg/businesses/valuation-duties-taxes-fees/goods-and-services-tax-gst/