Captains of Crush Grippers is rated 4.9 out of 5 by 130 .

Rated 4 out of 5 by Emarb from Really tested my strength 4 stars due to shipping nearly over a month and a half it took to receive my c.o.c’s haha. Really glad I finally have them but I’m sure the rona had something to do with it.

Rated 5 out of 5 by jmcatee10 from Grip strength This is a nice product for grip improvement. I highly recommend it for anyone who would like to strengthen this area on the body. If you never focused on grip strength before it would help if you start with trainer set and once you advance you can use them as warm-up.

Rated 5 out of 5 by Moses_38 from Very Satisfied My COC #4 are great definitely separates the men from the boys I need to get the #3 also

Rated 5 out of 5 by Puneet from Good Quality product Bought this since I wanted to strengthen my grip. This is a quality product - well built and sturdy. I have another one from Target. This one is much much better. Highly recommend.

Rated 5 out of 5 by CMP24 from Best grippers on the planet... Have the guide, Trainer, 1, 1.5 and 2-work up to 2 like any other body part-max close # 2 4 times-but gotta put time in. Thx for an exceptional product!

Rated 5 out of 5 by Loustrength from Gripping! Great quality! Great way to finish up a arm workout!

Rated 5 out of 5 by Luxx from Great challenge, fun to use Bought these cause I was curious but also with the goal of seeing some strength transfer to my deadlift. I was pretty humbled. I picked up the trainer and the #1 which was a perfect start for me. Could only close the #1 for about one rep. For reference I am a 185 lbs M and my max double overhand, no hookgrip deadlift was 365~385.