Very good construction. Rotation is smooth, though a bit tight for a few of them. All came with mounting screws and washers not shown in the pictures. The resistance between the two sides of each potentiometer varies from 30 ohms to 50 ohms but I found one with a 300 ohm variation. Values range from 9.8k to almost 11k. Depending on the application that may or may not be important. Packaging must improve because during shipment things can go wrong. In any case, I received them 9 days after I placed an order. My estimations show that it takes 5 days for the items to reach LAX after they ship out of the warehouse. Pretty fast, I would think. Discounts due to multiple items and coupons made this a sweet deal.