Why the kit doesn't contain loop and tube?

The kit doesn't contain the loop and the plastic tube because that material is very common in all labs. In general the labs obtain good price on the plastic disposable. We want to offer the most competitive price which means that if we had to furnish this material, we would have to take a little margin on it to cover generated administrative costs and price of shipment would be higher. On the economical point of view it is more interesting for the customer to buy loops and tubes himself. With the dropper bottle, he doesn't have to use any micropipettes. He just needs one inoculating loops and one 3mL or 5 mL test tube.