These are great tools to help with flexibility, improving jump and tumble strength among many other things.
2 different weight options.
2 pieces included per set.
Weights are all adjustable & each piece can come off to make it lighter to suit the age group. 

500g per piece in the set (recommended for anyone under 16) 

(Recommend anyone under 12 remove at least half of the pieces to begin with for a more gentle easing in.) 

1kg per piece set (advanced- only recommended for over 16/17yrs )