What are the differences between the McCallum bagpipe sets?

Projection Mounts Ferrules Ringcaps Slides Mouth Piece Chanter Styles
AB0
£550.01 (inc. VAT)
Small Wooden Nickel Nickel Nickel Nickel & Wood McCallum Plastic
AB1
£595.00 (inc. VAT)
Full Wooden Nickel Nickel Nickel Nickel & Wood McCallum Plastic
AB2
£624.99 (inc. VAT)
Imitation Ivory Nickel Nickel with Ivory Bushes Nickel Nickel & Ivory McCallum Plastic
AB3
£695.00 (inc. VAT)
Imitation Ivory Imitation Ivory Imitation Ivory with Ivory Bushes Nickel Nickel & Ivory McCallum Plastic
AB4
£825.00 (inc. VAT)
Imitation Ivory Engraved Nickel Engraved Nickel Engraved Nickel Engraved Nickel & Ivory McCallum Wooden Thistle, Zoomorphic, Victorian Scroll or Celtic
AB5
£1,575.01 (inc. VAT)
Imitation Ivory Plain Silver Plain Silver with Ivory Bushes Plain Silver Imitation Ivory & Chased Silver McCallum Wooden
AB6
£1,895.00 (inc. VAT)
Imitation Ivory Chased Silver Chased Silver with Ivory Bushes Chased Silver Imitation Ivory & Chased Silver McCallum Wooden Celtic, Thistle or Zoomorphic
AB7
£2,725.00 (inc. VAT)
Plain Silver Plain Silver Plain Silver Plain Silver Plain Silver McCallum Wooden
AB8
£2,875.00 (inc. VAT)
Chased Silver Chased Silver Chased Silver Chased Silver Chased Silver McCallum Wooden Celtic, Thistle or Zoomorphic
AB9
£2,425.00 (inc. VAT)
Imitation Ivory Hand Engraved Silver Hand Engraved Silver Hand Engraved Silver Imitation Ivory & Hand Engraved Silver McCallum Wooden Thistle, Zoomorphic, Victorian Scroll or Celtic
AB10
£3,440.00 (inc. VAT)
Hand Engraved Silver Hand Engraved Silver Hand Engraved Silver Hand Engraved Silver Hand Engraved Silver McCallum Wooden Thistle, Zoomorphic, Victorian Scroll or Celtic