I buy mine at second wind Fitness -lrb- new -rrb- and absolutely love they . they be both smaller than my old 3 , 5 , 8 , & 10 lb dumbbell be ! I have use they every other day for 4 month now and they be like brand new , nothing break or feel shaky . they save space , have easy `` quick change '' by move the pin like Nautilaus machine back at the gym . I be extremely well-pleased . ca not recommend they highly enough . I be a 5 ' 2 '' woman and they fit in my hand better than those old 10lb dumbbell do !