They come in a clamshell so use caution when opening. I wish they were a little more durable (thicker plastic) for better protection. I bought these to use with 500 bulbs so I don't have to keep the caps fully covered all the time. The 3 clips they are molded into hold up great. They are in the same 3 places as the solid covers. It seems easiest to remove them from the bottom where the protrusions are on each side of the stem. This method applies less torque than trying to loosen the top tab first. Put them on so that the top flap is first. Then use both hands to snap the bottom tabs into place. This minimizes the torque applied to the plastic housing. I think this is where some reviewers complained about the plastic case cracking. UPDATE: 06/20/2018 This lens protection does its job on gravel and country roads. The plastic has so far withstood the desert sun (not cracked). Despite that, I didn't try to put them on and take them off during the purchase process. Once I'm done installing the fog lights those lights will be true high beams again and I'll have to use full covers to comply with the law (maybe?). In Nevada this is not an issue that some states and localities use to penalize motorists with more than 4 lights regardless of whether they are on while the vehicle is stopped. In these states, the additional lighting on the street must be closed. As previously mentioned, plastic crossbars can be double or triple the thickness and offer better protection. Any rock larger than a small ball at street or highway speeds will overcome the plastic and cause the lens to crack (in my opinion). Other than that they do their job, look good and are better than leaving the lens unprotected.