Le Professional stick-on cue tips are made by the Tweeten company in Chicago. These are oak tanned water buffalo leather tips, made to be harder, and more suited to advanced players, than Elkmaster. These tips are often found supplied on quality two piece pool cues. They do require more attention to shaping and trimming, but many pros believe that the effort is rewarded.
Blue Velvet tips, by Cannon, are intended as a budget tip for use by snooker and pool halls on house cues. However, having said that, I've read a review that suggested they were well worth a try as they have slightly different characteristics to Elkmaster and Blue Diamond tips. The suggestion is that these are easier to shape, easy to roughen, good at holding chalk and surprisingly responsive.Select the diameter required when ordering