i mix my wheels with the blacks on the left and pinks on the rights for grip and speed. that set-up works great on all floors (wooden, smooth cement and sport court)!!! the only complaint i have is that i've had these wheels for 4 months and they are balding fast! i'm already looking for more wheels. I'm hard on my wheels with cutting turns, stopping, and jumping. They are great for regular skating but i would spend the extra money for some better wheels if you derby!

I've been skating with these wheels since April (the black super sticky ones). I love them, but just a warning they are VERY sticky! I love the control I get from them, but I ended up with a stress fracture in the bottom of my foot from the pressure from them. I do highly recommend them if you skate on a slick floor and want more grip!

I started roller derby training on my Radar Energy wheels for outside until I got indoor wheels. One of the sweet girls let me borrow her Hot Pink (94A) Radar Tuners, and I've been really enjoying them. They're smooth and quick.

The Tuner is a great wheel for this price point. I have the green (x-firm), and I have no complaints. They grip with no slip!

If you want something that is really grippy get these I have the red ones and I do Derby, They seem like they stick alittle too much to the floor for me though but alot of people like Grip.