These weight pockets can be added to your cylinder strap to carry a total of up to 4kgs and also serve to stabilize your cylinder when using a soft plate/harness (like COMPACT LITE or our soft harnesses like https://soprastek.com/shop/soft-harness-no-plate-with-ss-rings/ or https://soprastek.com/shop/soft-harness-universal-tek/). Any colour is possible. As you can see the distance of the two tubes is wide making it more suitable for a soft harness to adapt to your back. When using a hard plate you would prefer https://soprastek.com/shop/tank-stabilizer-with-weight-pockets-i