Spool

A spool assembly which includes a container with a planar surface and a wall at a periphery of the surface, the wall including an inner side which faces towards the planar surface and at least first and second spools on the surface, each spool, having a first end configured to be coupled to a detonator and a second end configured to be coupled to a connector, each spool including a first flange with a first inner face and a first outer face, a second flange with a second inner face and a second outer face, and a core which is positioned between and which is connected to the first and second flanges with the first inner face opposing the second inner face thereby defining an annular space within which most of an elongate flexible conductor is coiled, around the core, the first flange including detonator locating formations and connector locating formations on the first outer face, a first exit formation for the conductor and a second exit formation for the conductor whereby said first end and said second end are positionable on the first outer face and are respectively engageable with a detonator engaged with the detonator locating formations and a connector engaged with the connector locating formations,

• wherein the first spool includes, on a peripheral surface, a respective contact formation which opposes a similar respective contact formation on the second spool so that in plan the first spool is orientated oppositely to the orientation of the second spool which is adjacent and abutting the first spool, and wherein the planar surface is sized, relative to the sizes of the spools, so that the spools substantially abut opposed surfaces of the inner side of the wall.