No trace scope rings.

Only excess screw torque on the top straps will damage a scope tube. The only issues I've ever had was with the BKL two piece double strap mounts because I found that 15 in/lbs of torque on the ends of those narrow straps will deform a Vortex Diamondback scope tube. 

Never had the same problem with the BKL one piece mount and their wider top straps using the same torque. No issues with the cheap UTG mounts either with their 4 screws on the even wider top straps when torqued to 15 in/lbs. I do have to admit however that to keep the scope in place in the rings of a BKL mount on my .177 R9 I had to add a layer of cloth electrical friction tape in the saddles.