FXT Hybrid Stretch Elastics are a cross between the design properties of hollow and solid elastic. Similar stretch properties as hollow elastic without flattening or air bubbles. Smooth, durable, and long lasting, supplied in 2.5m lengths for one top kit. Available in 7 diameters (1.0mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm & 2.0mm).