Cando No-Latex (NL) stretch-tubing is made from a synthetic latex free substance that mimics the stretch and durability qualities of latex band. Cando tubing is used for rehabilitation, conditioning and especially personal training. All exercise tubing are lightweight, take up minimal room and are highly portable. There are 8 progressive levels of resistance to accommodate the lightest to the strongest needs. Until 2006 there were 7 levels of tubing - but because of the burgeoning fitness industry there are now 8! Need an even heavier tubing? You can double up to double the resistance or simply use a shorter piece! Cando is licensed to use the Thera-Band color sequence, so resistance level is easily identified. All Cando exercise products are CE certified.