The 9x3.00-6 suits Bolzzen Commando 4818 and Kintech Venom 9 series.
This 9*3.00-6 tyre is used on 6" rim models that do not support the more common, higher profile tyre such as 80/65-6 (10x3) due to clearance issues with fenders, suspension, callipers etc.
With the introduction of the CST 9x2.50-6, often that tyre is used in lieu of this tyre.
Other 9x3.00-6 tyres include Wanda P6262 (often Teverun factory fitted) and Tuovt (Kintech Venom 9).
If requiring tube, as this is a relatively uncommon size, there is particular tube to recommend however the 9x2" tube would be the best option.
Select/earlier Blade Mini models were constrained to 9x3.00-6. Super Scoots Canada suggestthat an 80/65-6 tyre can be fitted to Blade Mini series. A spacer can fitted to raise the clearance of the fender which enables 10x3 clearance.